Very -none helpful error - We are become experts in figuring these out lol..

WED error codes unhelpful... http://www.conitec.net/beta/editorerrors.htm

*.$$W is a backup of the .wed file...

I am able to safely delete it and the .wed file and then double-click the .wmp file to open the map in WED. ** I can't be sure you can

But that may be a fix... Also naming or and file location are the other things that come to mind...