Index: apichanges.xml
===================================================================
RCS file: /cvs/openide/fs/apichanges.xml,v
retrieving revision 1.4
diff -u -u -r1.4 apichanges.xml
--- apichanges.xml	6 Oct 2005 08:57:52 -0000	1.4
+++ apichanges.xml	25 Oct 2005 12:28:43 -0000
@@ -17,6 +17,22 @@
         <apidef name="filesystems">Filesystems API</apidef>
     </apidefs>
     <changes>
+        <change id="FileUtil.toFileObject">
+            <api name="filesystems"/>
+            <summary> <code>IllegalArgumentException</code> isn't thrown anymore.</summary>
+            <version major="6" minor="3"/>
+            <date day="25" month="10" year="2005"/>
+            <author login="rmatous"/>
+            <compatibility  modification="yes"/>
+            <description>
+                <p>Because of performance reasons from method
+                <code>FileUtil.toFileObject</code> was removed piece of code
+                checking whether file was properly normalized and thus
+                <code>IllegalArgumentException</code> can't be thrown.
+                </p>
+            </description>
+            <class package="org.openide.filesystems" name="FileUtil"/>
+        </change>
         <change id="no-static-file-ext-mappings">
             <api name="filesystems"/>
             <summary>Removed most static MIME type mappings</summary>
Index: src/org/openide/filesystems/FileUtil.java
===================================================================
RCS file: /cvs/openide/fs/src/org/openide/filesystems/FileUtil.java,v
retrieving revision 1.10
diff -u -u -r1.10 FileUtil.java
--- src/org/openide/filesystems/FileUtil.java	7 Oct 2005 13:49:14 -0000	1.10
+++ src/org/openide/filesystems/FileUtil.java	25 Oct 2005 12:28:44 -0000
@@ -393,21 +393,15 @@
      * If you are running with the MasterFS module enabled, that will guarantee
      * that this method never returns null for a file which exists on disk.
      * </p>
-     * @param file a disk file (may or may not exist)
+     * @param file a disk file (may or may not exist). This file
+     * must be normalized {@link #normalizeFile normalized}.
      * @return a corresponding file object, or null if the file does not exist
      *         or there is no {@link URLMapper} available to convert it
-     * @throws IllegalArgumentException if the file is not {@link #normalizeFile normalized}
      * @since 4.29
      */
     public static FileObject toFileObject(File file) throws IllegalArgumentException {
+        assert file.equals(normalizeFile(file)) : file.getAbsolutePath();
         FileObject retVal = null;
-
-        if (!file.equals(normalizeFile(file))) {
-            throw new IllegalArgumentException(
-                "Parameter file was not " + // NOI18N
-                "normalized. Was " + file + " instead of " + normalizeFile(file)
-            ); // NOI18N
-        }
 
         try {
             URL url = fileToURL(file);