diff --git a/libraries/stdlib/src/kotlin/io/files/FileTreeWalk.kt b/libraries/stdlib/src/kotlin/io/files/FileTreeWalk.kt
index f83a4095018..0b69834b956 100644
--- a/libraries/stdlib/src/kotlin/io/files/FileTreeWalk.kt
+++ b/libraries/stdlib/src/kotlin/io/files/FileTreeWalk.kt
@@ -212,15 +212,26 @@ public class FileTreeWalk(private val start: File,
     }
 
     /**
-     * Sets filter [predicate].
-     * Filter [predicate] function is called before visiting files and entering directories.
+     * Sets tree filter [predicate].
+     * Tree filter [predicate] function is called before visiting files and entering directories.
      * If it returns `false`, file is not visited, directory is not entered and all its content is also not visited.
      * If it returns `true`, everything goes in the regular way.
      */
+    @Deprecated("Use treeFilter instead", ReplaceWith("treeFilter(predicate)"))
     public fun filter(predicate: (File) -> Boolean): FileTreeWalk {
         return FileTreeWalk(start, direction, enter, leave, fail, predicate, maxDepth)
     }
 
+    /**
+     * Sets tree filter [predicate].
+     * Tree filter [predicate] function is called before visiting files and entering directories.
+     * If it returns `false`, file is not visited, directory is not entered and all its content is also not visited.
+     * If it returns `true`, everything goes in the regular way.
+     */
+    public fun treeFilter(predicate: (File) -> Boolean): FileTreeWalk {
+        return FileTreeWalk(start, direction, enter, leave, fail, predicate, maxDepth)
+    }
+
     /**
      * Sets maximum [depth] of walk. Int.MAX_VALUE is used for unlimited.
      * Negative and zero values are not allowed.
diff --git a/libraries/stdlib/src/kotlin/io/files/Utils.kt b/libraries/stdlib/src/kotlin/io/files/Utils.kt
index 478568f4f33..90a72192164 100644
--- a/libraries/stdlib/src/kotlin/io/files/Utils.kt
+++ b/libraries/stdlib/src/kotlin/io/files/Utils.kt
@@ -90,6 +90,7 @@ public val File.extension: String
  *
  * @return the pathname with system separators.
  */
+@Deprecated("Use File.separatorsToSystem instead", ReplaceWith("File(this).separatorsToSystem()", "java.io.File"))
 public fun String.separatorsToSystem(): String {
     val otherSep = if (File.separator == "/") "\\" else "/"
     return replace(otherSep, File.separator)
@@ -100,6 +101,7 @@ public fun String.separatorsToSystem(): String {
  *
  * @return the pathname with system separators.
  */
+@Deprecated("This function is deprecated")
 public fun String.pathSeparatorsToSystem(): String {
     val otherSep = if (File.pathSeparator == ":") ";" else ":"
     return replace(otherSep, File.pathSeparator)
@@ -110,6 +112,7 @@ public fun String.pathSeparatorsToSystem(): String {
  *
  * @return the pathname with system separators.
  */
+@Deprecated("This function is deprecated")
 public fun String.allSeparatorsToSystem(): String {
     return separatorsToSystem().pathSeparatorsToSystem()
 }