diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/project/getModuleInfo.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/project/getModuleInfo.kt
index d92ca67d6ea..83ec4e2716c 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/project/getModuleInfo.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/project/getModuleInfo.kt
@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.idea.caches.lightClasses.KtLightClassForDecompiledDe
 import org.jetbrains.kotlin.idea.core.isInTestSourceContentKotlinAware
 import org.jetbrains.kotlin.idea.core.script.ScriptDependenciesManager
 import org.jetbrains.kotlin.idea.core.script.scriptRelatedModuleName
+import org.jetbrains.kotlin.idea.highlighter.OutsidersPsiFileSupportUtils
 import org.jetbrains.kotlin.idea.util.ProjectRootsUtil
 import org.jetbrains.kotlin.idea.util.isInSourceContentWithoutInjected
 import org.jetbrains.kotlin.idea.util.isKotlinBinary
@@ -59,9 +60,7 @@ fun getLibrarySourcesModuleInfos(project: Project, virtualFile: VirtualFile) =
     )
 
 fun getScriptRelatedModuleInfo(project: Project, virtualFile: VirtualFile): ModuleSourceInfo? {
-    val projectFileIndex = ProjectFileIndex.SERVICE.getInstance(project)
-
-    val moduleRelatedModuleInfo = getModuleRelatedModuleInfo(projectFileIndex, virtualFile)
+    val moduleRelatedModuleInfo = getModuleRelatedModuleInfo(project, virtualFile)
     if (moduleRelatedModuleInfo != null) {
         return moduleRelatedModuleInfo
     }
@@ -167,7 +166,7 @@ private fun <T> PsiElement.collectInfos(c: ModuleInfoCollector<T>): T {
             ?: return c.onFailure("Analyzing element of type ${this::class.java} in non-physical file $containingFile of type ${containingFile::class.java}\nText:\n$text")
 
     if (containingKtFile?.isScript() == true) {
-        getModuleRelatedModuleInfo(ProjectFileIndex.SERVICE.getInstance(project), virtualFile)?.let {
+        getModuleRelatedModuleInfo(project, virtualFile)?.let {
             return c.onResult(it)
         }
         findScriptDefinition(virtualFile, project)?.let {
@@ -207,14 +206,12 @@ private inline fun <T> collectInfosByVirtualFile(
     treatAsLibrarySource: Boolean,
     onOccurrence: (IdeaModuleInfo?) -> T
 ): T {
-
-    val projectFileIndex = ProjectFileIndex.SERVICE.getInstance(project)
-
-    val moduleRelatedModuleInfo = getModuleRelatedModuleInfo(projectFileIndex, virtualFile)
+    val moduleRelatedModuleInfo = getModuleRelatedModuleInfo(project, virtualFile)
     if (moduleRelatedModuleInfo != null) {
         onOccurrence(moduleRelatedModuleInfo)
     }
 
+    val projectFileIndex = ProjectFileIndex.SERVICE.getInstance(project)
     projectFileIndex.getOrderEntriesForFile(virtualFile).forEach {
         it.toIdeaModuleInfo(project, virtualFile, treatAsLibrarySource).map(onOccurrence)
     }
@@ -235,7 +232,9 @@ private inline fun <T> collectInfosByVirtualFile(
     return onOccurrence(null)
 }
 
-private fun getModuleRelatedModuleInfo(projectFileIndex: ProjectFileIndex, virtualFile: VirtualFile): ModuleSourceInfo? {
+private fun getModuleRelatedModuleInfo(project: Project, virtualFile: VirtualFile): ModuleSourceInfo? {
+    val projectFileIndex = ProjectFileIndex.SERVICE.getInstance(project)
+
     val module = projectFileIndex.getModuleForFile(virtualFile)
     if (module != null && !module.isDisposed) {
         val moduleFileIndex = ModuleRootManager.getInstance(module).fileIndex
@@ -245,6 +244,12 @@ private fun getModuleRelatedModuleInfo(projectFileIndex: ProjectFileIndex, virtu
             return module.productionSourceInfo()
         }
     }
+
+    val fileOrigin = OutsidersPsiFileSupportUtils.getOutsiderFileOrigin(project, virtualFile)
+    if (fileOrigin != null) {
+        return getModuleRelatedModuleInfo(project, fileOrigin)
+    }
+
     return null
 }
 
diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/KotlinHighlightingUtil.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/KotlinHighlightingUtil.kt
index 6d22aa7a372..299a00f9eb7 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/KotlinHighlightingUtil.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/KotlinHighlightingUtil.kt
@@ -38,6 +38,10 @@ object KotlinHighlightingUtil {
             return shouldHighlightScript(ktFile)
         }
 
+        if (OutsidersPsiFileSupportWrapper.isOutsiderFile(ktFile.virtualFile)) {
+            return true
+        }
+
         return ProjectRootsUtil.isInProjectOrLibraryContent(ktFile) && ktFile.getModuleInfo() !is NotUnderContentRootModuleInfo
     }
 
diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportUtils.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportUtils.kt
new file mode 100644
index 00000000000..9ed5e59ee2c
--- /dev/null
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportUtils.kt
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.highlighter
+
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.vfs.VfsUtil
+import com.intellij.openapi.vfs.VirtualFile
+import java.io.File
+
+object OutsidersPsiFileSupportUtils {
+    fun getOutsiderFileOrigin(project: Project, virtualFile: VirtualFile): VirtualFile? {
+        if (!OutsidersPsiFileSupportWrapper.isOutsiderFile(virtualFile)) return null
+
+        val originalFilePath = OutsidersPsiFileSupportWrapper.getOriginalFilePath(virtualFile) ?: return null
+
+        return generateSequence(File(originalFilePath)) { if (it.canonicalPath == project.baseDir.canonicalPath) null else it.parentFile }
+            .filter { it.exists() }
+            .firstOrNull()
+            ?.let { VfsUtil.findFileByIoFile(it, false) }
+    }
+}
\ No newline at end of file
diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportWrapper.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportWrapper.kt
new file mode 100644
index 00000000000..7aa3d6836dd
--- /dev/null
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportWrapper.kt
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.highlighter
+
+import com.intellij.codeInsight.daemon.OutsidersPsiFileSupport
+import com.intellij.openapi.vfs.VirtualFile
+
+object OutsidersPsiFileSupportWrapper {
+    fun isOutsiderFile(virtualFile: VirtualFile): Boolean {
+        return OutsidersPsiFileSupport.isOutsiderFile(virtualFile)
+    }
+
+    fun getOriginalFilePath(virtualFile: VirtualFile): String? {
+        return OutsidersPsiFileSupport.getOriginalFilePath(virtualFile)
+    }
+}
\ No newline at end of file
diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportWrapper.kt.181 b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportWrapper.kt.181
new file mode 100644
index 00000000000..1be7d2a1b65
--- /dev/null
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/OutsidersPsiFileSupportWrapper.kt.181
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.highlighter
+
+import com.intellij.openapi.vfs.VirtualFile
+
+object OutsidersPsiFileSupportWrapper {
+    fun isOutsiderFile(virtualFile: VirtualFile): Boolean {
+        return false
+    }
+
+    fun getOriginalFilePath(virtualFile: VirtualFile): String? {
+        return null
+    }
+}
\ No newline at end of file