Index: trunk/src/org/openstreetmap/josm/actions/OpenFileAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/OpenFileAction.java	(revision 13726)
+++ trunk/src/org/openstreetmap/josm/actions/OpenFileAction.java	(revision 13727)
@@ -36,4 +36,5 @@
 import org.openstreetmap.josm.gui.MainApplication;
 import org.openstreetmap.josm.gui.MapFrame;
+import org.openstreetmap.josm.gui.Notification;
 import org.openstreetmap.josm.gui.PleaseWaitRunnable;
 import org.openstreetmap.josm.gui.io.importexport.AllFormatsImporter;
@@ -146,4 +147,8 @@
                         this.files.add(file);
                     }
+                } else {
+                    String message = tr("Unable to locate file  ''{0}''.", file.getPath());
+                    Logging.warn(message);
+                    new Notification(message).show();
                 }
             }