diff --git a/compiler/cli/src/org/jetbrains/jet/cli/jvm/compiler/JetCoreEnvironment.java b/compiler/cli/src/org/jetbrains/jet/cli/jvm/compiler/JetCoreEnvironment.java
index 2ca4ab293c9..29908780f6e 100644
--- a/compiler/cli/src/org/jetbrains/jet/cli/jvm/compiler/JetCoreEnvironment.java
+++ b/compiler/cli/src/org/jetbrains/jet/cli/jvm/compiler/JetCoreEnvironment.java
@@ -144,9 +144,8 @@ public class JetCoreEnvironment {
         applicationEnvironment.registerFileType(PlainTextFileType.INSTANCE, "xml");
 
         applicationEnvironment.registerFileType(JetFileType.INSTANCE, "kt");
-        applicationEnvironment.registerFileType(JetFileType.INSTANCE, "kts");
         applicationEnvironment.registerFileType(JetFileType.INSTANCE, "ktm");
-        applicationEnvironment.registerFileType(JetFileType.INSTANCE, JetParserDefinition.KTSCRIPT_FILE_SUFFIX); // should be renamed to kts
+        applicationEnvironment.registerFileType(JetFileType.INSTANCE, JetParserDefinition.STD_SCRIPT_SUFFIX); // should be renamed to kts
         applicationEnvironment.registerParserDefinition(new JavaParserDefinition());
         applicationEnvironment.registerParserDefinition(new JetParserDefinition());
 
diff --git a/compiler/cli/src/org/jetbrains/jet/cli/jvm/repl/ReplInterpreter.java b/compiler/cli/src/org/jetbrains/jet/cli/jvm/repl/ReplInterpreter.java
index 306fda6b5f9..83745cce09c 100644
--- a/compiler/cli/src/org/jetbrains/jet/cli/jvm/repl/ReplInterpreter.java
+++ b/compiler/cli/src/org/jetbrains/jet/cli/jvm/repl/ReplInterpreter.java
@@ -47,6 +47,7 @@ import org.jetbrains.jet.di.InjectorForTopDownAnalyzerForJvm;
 import org.jetbrains.jet.lang.descriptors.ModuleDescriptorImpl;
 import org.jetbrains.jet.lang.descriptors.ScriptDescriptor;
 import org.jetbrains.jet.lang.descriptors.impl.PackageLikeBuilderDummy;
+import org.jetbrains.jet.lang.parsing.JetParserDefinition;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.jet.lang.psi.JetScript;
 import org.jetbrains.jet.lang.resolve.*;
@@ -209,7 +210,7 @@ public class ReplInterpreter {
         }
         fullText.append(line);
 
-        LightVirtualFile virtualFile = new LightVirtualFile("line" + lineNumber + ".ktscript", JetLanguage.INSTANCE, fullText.toString());
+        LightVirtualFile virtualFile = new LightVirtualFile("line" + lineNumber + JetParserDefinition.STD_SCRIPT_EXT, JetLanguage.INSTANCE, fullText.toString());
         virtualFile.setCharset(CharsetToolkit.UTF8_CHARSET);
         JetFile psiFile = (JetFile) ((PsiFileFactoryImpl) PsiFileFactory.getInstance(jetCoreEnvironment.getProject())).trySetupPsiForFile(virtualFile, JetLanguage.INSTANCE, true, false);
 
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetParser.java b/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetParser.java
index ba3556879da..a7702d673e6 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetParser.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetParser.java
@@ -26,7 +26,6 @@ import org.jetbrains.annotations.NotNull;
 
 public class JetParser implements PsiParser {
 
-    public static final String STD_SCRIPT_EXT = "." + JetParserDefinition.KTSCRIPT_FILE_SUFFIX;
     private final JetScriptDefinitionProvider scriptDefinitionProvider;
 
     public JetParser(Project project) {
@@ -43,7 +42,8 @@ public class JetParser implements PsiParser {
     @NotNull
     public ASTNode parse(IElementType iElementType, PsiBuilder psiBuilder, PsiFile psiFile) {
         JetParsing jetParsing = JetParsing.createForTopLevel(new SemanticWhitespaceAwarePsiBuilderImpl(psiBuilder));
-        if (scriptDefinitionProvider != null && scriptDefinitionProvider.isScript(psiFile) || psiFile.getName().endsWith(STD_SCRIPT_EXT)) {
+        if (scriptDefinitionProvider != null && scriptDefinitionProvider.isScript(psiFile)
+            || psiFile.getName().endsWith(JetParserDefinition.STD_SCRIPT_EXT)) {
             jetParsing.parseScript();
         }
         else {
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetParserDefinition.java b/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetParserDefinition.java
index 893ecaeceae..eec764ff0cd 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetParserDefinition.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetParserDefinition.java
@@ -40,7 +40,8 @@ import org.jetbrains.jet.lexer.JetTokens;
 import org.jetbrains.jet.plugin.JetLanguage;
 
 public class JetParserDefinition implements ParserDefinition {
-    public static final String KTSCRIPT_FILE_SUFFIX = "ktscript";
+    public static final String STD_SCRIPT_SUFFIX = "kts";
+    public static final String STD_SCRIPT_EXT = "." + STD_SCRIPT_SUFFIX;
 
     public JetParserDefinition() {
         //todo: ApplicationManager.getApplication() is null during JetParsingTest setting up
diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetScriptDefinitionProvider.java b/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetScriptDefinitionProvider.java
index f5df9a1848e..89ac6f8db20 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetScriptDefinitionProvider.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/parsing/JetScriptDefinitionProvider.java
@@ -29,10 +29,10 @@ public class JetScriptDefinitionProvider {
     private final HashMap<String,JetScriptDefinition> scripts = new HashMap<String, JetScriptDefinition>();
     private final HashSet<PsiFile> scriptsFiles = new HashSet<PsiFile>();
 
-    private static final JetScriptDefinition standardScript = new JetScriptDefinition(".ktscript", Collections.<AnalyzerScriptParameter>emptyList());
+    private static final JetScriptDefinition standardScript = new JetScriptDefinition(JetParserDefinition.STD_SCRIPT_EXT, Collections.<AnalyzerScriptParameter>emptyList());
 
     public JetScriptDefinitionProvider() {
-        // .ktscript will take analyzer parameters explicitly specified on compilation
+        // .kts will take analyzer parameters explicitly specified on compilation
         addScriptDefinition(standardScript);
     }
 
diff --git a/compiler/testData/cli/jvm/hello.ktscript b/compiler/testData/cli/jvm/hello.kts
similarity index 100%
rename from compiler/testData/cli/jvm/hello.ktscript
rename to compiler/testData/cli/jvm/hello.kts
diff --git a/compiler/testData/cli/jvm/printArguments.args b/compiler/testData/cli/jvm/printArguments.args
index ceb04a4ed2c..a32d2e7c5ba 100644
--- a/compiler/testData/cli/jvm/printArguments.args
+++ b/compiler/testData/cli/jvm/printArguments.args
@@ -1,3 +1,3 @@
 -printArgs
 -script
-$TESTDATA_DIR$/hello.ktscript
\ No newline at end of file
+$TESTDATA_DIR$/hello.kts
\ No newline at end of file
diff --git a/compiler/testData/cli/jvm/printArguments.out b/compiler/testData/cli/jvm/printArguments.out
index 19331bb7737..cac7a47734a 100644
--- a/compiler/testData/cli/jvm/printArguments.out
+++ b/compiler/testData/cli/jvm/printArguments.out
@@ -1,3 +1,3 @@
-INFO: Invoking compiler org.jetbrains.jet.cli.jvm.K2JVMCompiler with arguments -printArgs -script compiler/testData/cli/jvm/hello.ktscript
+INFO: Invoking compiler org.jetbrains.jet.cli.jvm.K2JVMCompiler with arguments -printArgs -script compiler/testData/cli/jvm/hello.kts
 hello
 OK
diff --git a/compiler/testData/cli/jvm/script.args b/compiler/testData/cli/jvm/script.args
index 1430ed2a05d..1f3bc38ff29 100644
--- a/compiler/testData/cli/jvm/script.args
+++ b/compiler/testData/cli/jvm/script.args
@@ -1,4 +1,4 @@
 -script
-$TESTDATA_DIR$/script.ktscript
+$TESTDATA_DIR$/script.kts
 hi
 there
\ No newline at end of file
diff --git a/compiler/testData/cli/jvm/script.ktscript b/compiler/testData/cli/jvm/script.kts
similarity index 100%
rename from compiler/testData/cli/jvm/script.ktscript
rename to compiler/testData/cli/jvm/script.kts
diff --git a/compiler/testData/codegen/script/empty.ktscript b/compiler/testData/codegen/script/empty.kts
similarity index 100%
rename from compiler/testData/codegen/script/empty.ktscript
rename to compiler/testData/codegen/script/empty.kts
diff --git a/compiler/testData/codegen/script/fibwprunner.ktscript b/compiler/testData/codegen/script/fibwprunner.kts
similarity index 100%
rename from compiler/testData/codegen/script/fibwprunner.ktscript
rename to compiler/testData/codegen/script/fibwprunner.kts
diff --git a/compiler/testData/codegen/script/helloWorld.ktscript b/compiler/testData/codegen/script/helloWorld.kts
similarity index 100%
rename from compiler/testData/codegen/script/helloWorld.ktscript
rename to compiler/testData/codegen/script/helloWorld.kts
diff --git a/compiler/testData/codegen/script/parameter.ktscript b/compiler/testData/codegen/script/parameter.kts
similarity index 100%
rename from compiler/testData/codegen/script/parameter.ktscript
rename to compiler/testData/codegen/script/parameter.kts
diff --git a/compiler/testData/codegen/script/parameterArray.ktscript b/compiler/testData/codegen/script/parameterArray.kts
similarity index 100%
rename from compiler/testData/codegen/script/parameterArray.ktscript
rename to compiler/testData/codegen/script/parameterArray.kts
diff --git a/compiler/testData/codegen/script/parameterClosure.ktscript b/compiler/testData/codegen/script/parameterClosure.kts
similarity index 100%
rename from compiler/testData/codegen/script/parameterClosure.ktscript
rename to compiler/testData/codegen/script/parameterClosure.kts
diff --git a/compiler/testData/codegen/script/parameterLong.ktscript b/compiler/testData/codegen/script/parameterLong.kts
similarity index 100%
rename from compiler/testData/codegen/script/parameterLong.ktscript
rename to compiler/testData/codegen/script/parameterLong.kts
diff --git a/compiler/testData/codegen/script/secondLevelFunction.ktscript b/compiler/testData/codegen/script/secondLevelFunction.kts
similarity index 100%
rename from compiler/testData/codegen/script/secondLevelFunction.ktscript
rename to compiler/testData/codegen/script/secondLevelFunction.kts
diff --git a/compiler/testData/codegen/script/secondLevelFunctionClosure.ktscript b/compiler/testData/codegen/script/secondLevelFunctionClosure.kts
similarity index 100%
rename from compiler/testData/codegen/script/secondLevelFunctionClosure.ktscript
rename to compiler/testData/codegen/script/secondLevelFunctionClosure.kts
diff --git a/compiler/testData/codegen/script/secondLevelVal.ktscript b/compiler/testData/codegen/script/secondLevelVal.kts
similarity index 100%
rename from compiler/testData/codegen/script/secondLevelVal.ktscript
rename to compiler/testData/codegen/script/secondLevelVal.kts
diff --git a/compiler/testData/codegen/script/string.ktscript b/compiler/testData/codegen/script/string.kts
similarity index 100%
rename from compiler/testData/codegen/script/string.ktscript
rename to compiler/testData/codegen/script/string.kts
diff --git a/compiler/testData/codegen/script/topLevelFunction.ktscript b/compiler/testData/codegen/script/topLevelFunction.kts
similarity index 100%
rename from compiler/testData/codegen/script/topLevelFunction.ktscript
rename to compiler/testData/codegen/script/topLevelFunction.kts
diff --git a/compiler/testData/codegen/script/topLevelFunctionClosure.ktscript b/compiler/testData/codegen/script/topLevelFunctionClosure.kts
similarity index 100%
rename from compiler/testData/codegen/script/topLevelFunctionClosure.ktscript
rename to compiler/testData/codegen/script/topLevelFunctionClosure.kts
diff --git a/compiler/testData/codegen/script/topLevelProperty.ktscript b/compiler/testData/codegen/script/topLevelProperty.kts
similarity index 100%
rename from compiler/testData/codegen/script/topLevelProperty.ktscript
rename to compiler/testData/codegen/script/topLevelProperty.kts
diff --git a/compiler/testData/diagnostics/tests/script/AccessForwardDeclarationInScript.ktscript b/compiler/testData/diagnostics/tests/script/AccessForwardDeclarationInScript.kts
similarity index 100%
rename from compiler/testData/diagnostics/tests/script/AccessForwardDeclarationInScript.ktscript
rename to compiler/testData/diagnostics/tests/script/AccessForwardDeclarationInScript.kts
diff --git a/compiler/testData/diagnostics/tests/script/ComplexScript.ktscript b/compiler/testData/diagnostics/tests/script/ComplexScript.kts
similarity index 100%
rename from compiler/testData/diagnostics/tests/script/ComplexScript.ktscript
rename to compiler/testData/diagnostics/tests/script/ComplexScript.kts
diff --git a/compiler/testData/diagnostics/tests/script/SimpleScript.ktscript b/compiler/testData/diagnostics/tests/script/SimpleScript.kts
similarity index 100%
rename from compiler/testData/diagnostics/tests/script/SimpleScript.ktscript
rename to compiler/testData/diagnostics/tests/script/SimpleScript.kts
diff --git a/compiler/testData/diagnostics/tests/script/imports.ktscript b/compiler/testData/diagnostics/tests/script/imports.kts
similarity index 100%
rename from compiler/testData/diagnostics/tests/script/imports.ktscript
rename to compiler/testData/diagnostics/tests/script/imports.kts
diff --git a/compiler/testData/psi/script/ComplexScript.ktscript b/compiler/testData/psi/script/ComplexScript.kts
similarity index 100%
rename from compiler/testData/psi/script/ComplexScript.ktscript
rename to compiler/testData/psi/script/ComplexScript.kts
diff --git a/compiler/testData/psi/script/ComplexScript.txt b/compiler/testData/psi/script/ComplexScript.txt
index 22bd52a6ce9..796104d4afd 100644
--- a/compiler/testData/psi/script/ComplexScript.txt
+++ b/compiler/testData/psi/script/ComplexScript.txt
@@ -1,4 +1,4 @@
-JetFile: ComplexScript.ktscript
+JetFile: ComplexScript.kts
   PACKAGE_DIRECTIVE
     <empty list>
   SCRIPT
diff --git a/compiler/testData/psi/script/Import.ktscript b/compiler/testData/psi/script/Import.kts
similarity index 100%
rename from compiler/testData/psi/script/Import.ktscript
rename to compiler/testData/psi/script/Import.kts
diff --git a/compiler/testData/psi/script/Import.txt b/compiler/testData/psi/script/Import.txt
index 2ed21609755..7fb1a3cd7e4 100644
--- a/compiler/testData/psi/script/Import.txt
+++ b/compiler/testData/psi/script/Import.txt
@@ -1,4 +1,4 @@
-JetFile: Import.ktscript
+JetFile: Import.kts
   PACKAGE_DIRECTIVE
     <empty list>
   SCRIPT
diff --git a/compiler/testData/psi/script/Shebang.ktscript b/compiler/testData/psi/script/Shebang.kts
similarity index 100%
rename from compiler/testData/psi/script/Shebang.ktscript
rename to compiler/testData/psi/script/Shebang.kts
diff --git a/compiler/testData/psi/script/Shebang.txt b/compiler/testData/psi/script/Shebang.txt
index e67a0c0cd54..7c1c2103f2a 100644
--- a/compiler/testData/psi/script/Shebang.txt
+++ b/compiler/testData/psi/script/Shebang.txt
@@ -1,4 +1,4 @@
-JetFile: Shebang.ktscript
+JetFile: Shebang.kts
   PsiComment(SHEBANG_COMMENT)('#!/usr/bin/env kotlin')
   PsiWhiteSpace('\n\n')
   PACKAGE_DIRECTIVE
diff --git a/compiler/testData/psi/script/ShebangIncorrect.ktscript b/compiler/testData/psi/script/ShebangIncorrect.kts
similarity index 100%
rename from compiler/testData/psi/script/ShebangIncorrect.ktscript
rename to compiler/testData/psi/script/ShebangIncorrect.kts
diff --git a/compiler/testData/psi/script/ShebangIncorrect.txt b/compiler/testData/psi/script/ShebangIncorrect.txt
index a6b59d43145..1d53b7aa58c 100644
--- a/compiler/testData/psi/script/ShebangIncorrect.txt
+++ b/compiler/testData/psi/script/ShebangIncorrect.txt
@@ -1,4 +1,4 @@
-JetFile: ShebangIncorrect.ktscript
+JetFile: ShebangIncorrect.kts
   PACKAGE_DIRECTIVE
     <empty list>
   SCRIPT
diff --git a/compiler/testData/psi/script/SimpleScript.ktscript b/compiler/testData/psi/script/SimpleScript.kts
similarity index 100%
rename from compiler/testData/psi/script/SimpleScript.ktscript
rename to compiler/testData/psi/script/SimpleScript.kts
diff --git a/compiler/testData/psi/script/SimpleScript.txt b/compiler/testData/psi/script/SimpleScript.txt
index f6d61720a97..3a2f51fdf50 100644
--- a/compiler/testData/psi/script/SimpleScript.txt
+++ b/compiler/testData/psi/script/SimpleScript.txt
@@ -1,4 +1,4 @@
-JetFile: SimpleScript.ktscript
+JetFile: SimpleScript.kts
   PACKAGE_DIRECTIVE
     <empty list>
   SCRIPT
diff --git a/compiler/testData/repl/analyzeErrors.repl b/compiler/testData/repl/analyzeErrors.repl
index 9da9f4ee905..e3cbe6eb8b9 100644
--- a/compiler/testData/repl/analyzeErrors.repl
+++ b/compiler/testData/repl/analyzeErrors.repl
@@ -1,6 +1,6 @@
 >>> fun foo() = 765
 null
 >>> foo(1)
-ERROR: /line2.ktscript: (1, 5) Too many arguments for internal final fun foo(): kotlin.Int defined in <script>
+ERROR: /line2.kts: (1, 5) Too many arguments for internal final fun foo(): kotlin.Int defined in <script>
 >>> foo()
 765
diff --git a/compiler/testData/repl/syntaxErrors.repl b/compiler/testData/repl/syntaxErrors.repl
index 8158f85fd94..9eef3ab65c7 100644
--- a/compiler/testData/repl/syntaxErrors.repl
+++ b/compiler/testData/repl/syntaxErrors.repl
@@ -1,6 +1,6 @@
 >>> )(
-ERROR: /line1.ktscript: (1, 1) Expecting an element
-ERROR: /line1.ktscript: (1, 3) Expecting an expression
+ERROR: /line1.kts: (1, 1) Expecting an element
+ERROR: /line1.kts: (1, 3) Expecting an expression
 >>> fun foo() = 98
 null
 >>> foo()
diff --git a/compiler/testData/script/fib.ktscript b/compiler/testData/script/fib.kts
similarity index 100%
rename from compiler/testData/script/fib.ktscript
rename to compiler/testData/script/fib.kts
diff --git a/compiler/testData/script/fib.pkg.ktscript b/compiler/testData/script/fib.pkg.kts
similarity index 100%
rename from compiler/testData/script/fib.pkg.ktscript
rename to compiler/testData/script/fib.pkg.kts
diff --git a/compiler/tests/org/jetbrains/jet/JetTestCaseBuilder.java b/compiler/tests/org/jetbrains/jet/JetTestCaseBuilder.java
index 79988cb7ab5..502a4883ddb 100644
--- a/compiler/tests/org/jetbrains/jet/JetTestCaseBuilder.java
+++ b/compiler/tests/org/jetbrains/jet/JetTestCaseBuilder.java
@@ -34,7 +34,7 @@ import static com.intellij.openapi.util.io.FileUtil.toSystemIndependentName;
 
 public abstract class JetTestCaseBuilder {
 
-    public static final FilenameFilter KOTLIN_FILTER = filterByExtension("kt", JetParserDefinition.KTSCRIPT_FILE_SUFFIX);
+    public static final FilenameFilter KOTLIN_FILTER = filterByExtension("kt", JetParserDefinition.STD_SCRIPT_SUFFIX);
 
     @NotNull
     public static FilenameFilter filterByExtension(@NotNull final String... extensions) {
diff --git a/compiler/tests/org/jetbrains/jet/ScriptTest.java b/compiler/tests/org/jetbrains/jet/ScriptTest.java
index 11f4061ea1a..6be92f5b5d0 100644
--- a/compiler/tests/org/jetbrains/jet/ScriptTest.java
+++ b/compiler/tests/org/jetbrains/jet/ScriptTest.java
@@ -44,14 +44,14 @@ import java.util.List;
 public class ScriptTest {
     @Test
     public void testScript() throws Exception {
-        Class<?> aClass = compileScript("fib.ktscript", numIntParam(), Collections.<JetScriptDefinition>emptyList());
+        Class<?> aClass = compileScript("fib.kts", numIntParam(), Collections.<JetScriptDefinition>emptyList());
         Assert.assertNotNull(aClass);
         aClass.getConstructor(int.class).newInstance(4);
     }
 
     @Test
     public void testScriptWithPackage() throws Exception {
-        Class<?> aClass = compileScript("fib.pkg.ktscript", numIntParam(), Collections.<JetScriptDefinition>emptyList());
+        Class<?> aClass = compileScript("fib.pkg.kts", numIntParam(), Collections.<JetScriptDefinition>emptyList());
         Assert.assertNotNull(aClass);
         aClass.getConstructor(int.class).newInstance(4);
     }
diff --git a/compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java b/compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java
index 055dee74226..8aaf5640121 100644
--- a/compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java
+++ b/compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java
@@ -7124,28 +7124,28 @@ public class JetDiagnosticsTestGenerated extends AbstractJetDiagnosticsTest {
     
     @TestMetadata("compiler/testData/diagnostics/tests/script")
     public static class Script extends AbstractJetDiagnosticsTest {
-        @TestMetadata("AccessForwardDeclarationInScript.ktscript")
+        @TestMetadata("AccessForwardDeclarationInScript.kts")
         public void testAccessForwardDeclarationInScript() throws Exception {
-            doTest("compiler/testData/diagnostics/tests/script/AccessForwardDeclarationInScript.ktscript");
+            doTest("compiler/testData/diagnostics/tests/script/AccessForwardDeclarationInScript.kts");
         }
         
         public void testAllFilesPresentInScript() throws Exception {
-            JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("compiler/testData/diagnostics/tests/script"), Pattern.compile("^(.+)\\.ktscript$"), true);
+            JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("compiler/testData/diagnostics/tests/script"), Pattern.compile("^(.+)\\.kts$"), true);
         }
         
-        @TestMetadata("ComplexScript.ktscript")
+        @TestMetadata("ComplexScript.kts")
         public void testComplexScript() throws Exception {
-            doTest("compiler/testData/diagnostics/tests/script/ComplexScript.ktscript");
+            doTest("compiler/testData/diagnostics/tests/script/ComplexScript.kts");
         }
         
-        @TestMetadata("imports.ktscript")
+        @TestMetadata("imports.kts")
         public void testImports() throws Exception {
-            doTest("compiler/testData/diagnostics/tests/script/imports.ktscript");
+            doTest("compiler/testData/diagnostics/tests/script/imports.kts");
         }
         
-        @TestMetadata("SimpleScript.ktscript")
+        @TestMetadata("SimpleScript.kts")
         public void testSimpleScript() throws Exception {
-            doTest("compiler/testData/diagnostics/tests/script/SimpleScript.ktscript");
+            doTest("compiler/testData/diagnostics/tests/script/SimpleScript.kts");
         }
         
     }
diff --git a/compiler/tests/org/jetbrains/jet/codegen/ScriptGenTest.java b/compiler/tests/org/jetbrains/jet/codegen/ScriptGenTest.java
index ec9ecbe8743..3c529821dca 100644
--- a/compiler/tests/org/jetbrains/jet/codegen/ScriptGenTest.java
+++ b/compiler/tests/org/jetbrains/jet/codegen/ScriptGenTest.java
@@ -97,58 +97,58 @@ public class ScriptGenTest extends CodegenTestCase {
     }
 
     public void testHelloWorld() {
-        blackBoxScript("script/helloWorld.ktscript");
+        blackBoxScript("script/helloWorld.kts");
     }
 
     public void testString() {
-        blackBoxScript("script/string.ktscript");
+        blackBoxScript("script/string.kts");
     }
 
     public void testTopLevelFunction() throws Exception {
-        blackBoxScript("script/topLevelFunction.ktscript");
+        blackBoxScript("script/topLevelFunction.kts");
         Method method = scriptInstance.getClass().getMethod("factorial", new Class<?>[]{ int.class });
         Object r = method.invoke(scriptInstance, 4);
         assertEquals(24, r);
     }
 
     public void testTopLevelFunctionClosure() {
-        blackBoxScript("script/topLevelFunctionClosure.ktscript");
+        blackBoxScript("script/topLevelFunctionClosure.kts");
     }
 
     public void testSecondLevelFunction() {
-        blackBoxScript("script/secondLevelFunction.ktscript");
+        blackBoxScript("script/secondLevelFunction.kts");
     }
 
     public void testSecondLevelFunctionClosure() {
-        blackBoxScript("script/secondLevelFunctionClosure.ktscript");
+        blackBoxScript("script/secondLevelFunctionClosure.kts");
     }
 
     public void testSecondLevelVal() {
-        blackBoxScript("script/secondLevelVal.ktscript");
+        blackBoxScript("script/secondLevelVal.kts");
     }
 
     public void testTopLevelProperty() {
-        blackBoxScript("script/topLevelProperty.ktscript");
+        blackBoxScript("script/topLevelProperty.kts");
     }
 
     public void testScriptParameter() {
-        blackBoxScript("script/parameter.ktscript");
+        blackBoxScript("script/parameter.kts");
     }
 
     public void testScriptParameterLong() {
-        blackBoxScript("script/parameterLong.ktscript");
+        blackBoxScript("script/parameterLong.kts");
     }
 
     public void testScriptParameterArray() {
-        blackBoxScript("script/parameterArray.ktscript");
+        blackBoxScript("script/parameterArray.kts");
     }
 
     public void testScriptParameterClosure() {
-        blackBoxScript("script/parameterClosure.ktscript");
+        blackBoxScript("script/parameterClosure.kts");
     }
 
     public void testEmpty() {
-        blackBoxScript("script/empty.ktscript");
+        blackBoxScript("script/empty.kts");
     }
 
     public void testLanguage() {
@@ -185,7 +185,7 @@ public class ScriptGenTest extends CodegenTestCase {
 
     public void testDependentScripts() {
         JetScriptDefinitionProvider.getInstance(myEnvironment.getProject()).addScriptDefinition(FIB_SCRIPT_DEFINITION);
-        loadFiles("script/fibwp.lang.kt", "script/fibwprunner.ktscript");
+        loadFiles("script/fibwp.lang.kt", "script/fibwprunner.kts");
         Class aClass = generateClass("Fibwprunner");
         try {
             Constructor constructor = aClass.getConstructor();
diff --git a/compiler/tests/org/jetbrains/jet/lang/resolve/lazy/AbstractLazyResolveDiagnosticsTest.java b/compiler/tests/org/jetbrains/jet/lang/resolve/lazy/AbstractLazyResolveDiagnosticsTest.java
index 5e5a257eea1..a2fbb258310 100644
--- a/compiler/tests/org/jetbrains/jet/lang/resolve/lazy/AbstractLazyResolveDiagnosticsTest.java
+++ b/compiler/tests/org/jetbrains/jet/lang/resolve/lazy/AbstractLazyResolveDiagnosticsTest.java
@@ -47,7 +47,7 @@ public abstract class AbstractLazyResolveDiagnosticsTest extends BaseDiagnostics
         PackageViewDescriptor expected = eagerModule.getPackage(FqName.ROOT);
         PackageViewDescriptor actual = lazyModule.getPackage(FqName.ROOT);
 
-        String txtFileRelativePath = path.replaceAll("\\.kt$|\\.ktscript", ".txt");
+        String txtFileRelativePath = path.replaceAll("\\.kt$|\\.kts$", ".txt");
         File txtFile = new File("compiler/testData/lazyResolve/diagnostics/" + txtFileRelativePath);
 
         // Only recurse into those packages mentioned in the files
diff --git a/generators/src/org/jetbrains/jet/generators/tests/GenerateTests.kt b/generators/src/org/jetbrains/jet/generators/tests/GenerateTests.kt
index f64c6af4ceb..e30af1d8392 100644
--- a/generators/src/org/jetbrains/jet/generators/tests/GenerateTests.kt
+++ b/generators/src/org/jetbrains/jet/generators/tests/GenerateTests.kt
@@ -109,7 +109,7 @@ fun main(args: Array<String>) {
 
         testClass(javaClass<AbstractJetDiagnosticsTest>()) {
             model("diagnostics/tests")
-            model("diagnostics/tests/script", extension = "ktscript")
+            model("diagnostics/tests/script", extension = "kts")
             model("codegen/box/functions/tailRecursion")
         }
 
@@ -469,8 +469,8 @@ fun main(args: Array<String>) {
         }
 
         testClass(javaClass<AbstractJetFormatterTest>()) {
-            model("formatter", pattern = """^([^\.]+)\.after.kt$""")
-            model("formatter", pattern = """^([^\.]+)\.after.inv.kt$""",
+            model("formatter", pattern = """^([^\.]+)\.after\.kt.*$""")
+            model("formatter", pattern = """^([^\.]+)\.after\.inv\.kt.*$""",
                   testMethod = "doTestInverted", testClassName = "FormatterInverted")
         }
 
diff --git a/idea/tests/org/jetbrains/jet/formatter/JetFormatterTestGenerated.java b/idea/tests/org/jetbrains/jet/formatter/JetFormatterTestGenerated.java
index fc88574dc6f..ac33a704a53 100644
--- a/idea/tests/org/jetbrains/jet/formatter/JetFormatterTestGenerated.java
+++ b/idea/tests/org/jetbrains/jet/formatter/JetFormatterTestGenerated.java
@@ -36,7 +36,7 @@ public class JetFormatterTestGenerated extends AbstractJetFormatterTest {
     @InnerTestClasses({Formatter.ModifierList.class})
     public static class Formatter extends AbstractJetFormatterTest {
         public void testAllFilesPresentInFormatter() throws Exception {
-            JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("idea/testData/formatter"), Pattern.compile("^([^\\.]+)\\.after.kt$"), true);
+            JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("idea/testData/formatter"), Pattern.compile("^([^\\.]+)\\.after\\.kt.*$"), true);
         }
         
         @TestMetadata("BlockFor.after.kt")
@@ -219,6 +219,11 @@ public class JetFormatterTestGenerated extends AbstractJetFormatterTest {
             doTest("idea/testData/formatter/SaveSpacesInDocComments.after.kt");
         }
         
+        @TestMetadata("Script.after.kts")
+        public void testScript() throws Exception {
+            doTest("idea/testData/formatter/Script.after.kts");
+        }
+        
         @TestMetadata("SingleLineFunctionLiteral.after.kt")
         public void testSingleLineFunctionLiteral() throws Exception {
             doTest("idea/testData/formatter/SingleLineFunctionLiteral.after.kt");
@@ -297,7 +302,7 @@ public class JetFormatterTestGenerated extends AbstractJetFormatterTest {
         @TestMetadata("idea/testData/formatter/modifierList")
         public static class ModifierList extends AbstractJetFormatterTest {
             public void testAllFilesPresentInModifierList() throws Exception {
-                JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("idea/testData/formatter/modifierList"), Pattern.compile("^([^\\.]+)\\.after.kt$"), true);
+                JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("idea/testData/formatter/modifierList"), Pattern.compile("^([^\\.]+)\\.after\\.kt.*$"), true);
             }
             
             @TestMetadata("funAnnotationBeforeAnnotation.after.kt")
@@ -394,7 +399,7 @@ public class JetFormatterTestGenerated extends AbstractJetFormatterTest {
     @InnerTestClasses({})
     public static class FormatterInverted extends AbstractJetFormatterTest {
         public void testAllFilesPresentInFormatterInverted() throws Exception {
-            JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("idea/testData/formatter"), Pattern.compile("^([^\\.]+)\\.after.inv.kt$"), true);
+            JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("idea/testData/formatter"), Pattern.compile("^([^\\.]+)\\.after\\.inv\\.kt.*$"), true);
         }
         
         @TestMetadata("CatchFinallyOnNewLine.after.inv.kt")