diff --git a/openide.filesystems/src/org/openide/filesystems/FileUtil.java b/openide.filesystems/src/org/openide/filesystems/FileUtil.java
--- a/openide.filesystems/src/org/openide/filesystems/FileUtil.java
+++ b/openide.filesystems/src/org/openide/filesystems/FileUtil.java
@@ -82,6 +82,7 @@
 import java.util.logging.Logger;
 import javax.swing.Icon;
 import javax.swing.JFileChooser;
+import javax.swing.SwingUtilities;
 import javax.swing.filechooser.FileSystemView;
 import org.netbeans.modules.openide.filesystems.declmime.MIMEResolverImpl;
 import org.openide.filesystems.FileSystem.AtomicAction;
@@ -1779,6 +1780,9 @@
     private static File normalizeFileImpl(File file) {
         // XXX should use NIO in JDK 7; see #6358641
         Parameters.notNull("file", file);  //NOI18N
+        if (SwingUtilities.isEventDispatchThread()) {
+            LOG.log(Level.WARNING, "FileUtil.normalizeFile(" + file +") called in EDT", new Exception());
+        }
         File retFile;
         LOG.log(Level.FINE, "FileUtil.normalizeFile for {0}", file); // NOI18N