Save My Map!

I've been working on and off on a huge map project (large amounts of custom units and abilities) and I just recently lost the ability to load it.
When I load it into World Editor, it gives me the error:
"- Level Info Missing or Invalid"
I might be able to find a backup copy on B.Net, but I was wondering if there was any way of saving my map first.

I think you might of used some type of speical trigger from a map editor and your tryin to open the map with the orgianl map editor maybe.