Opening a "protected" map

I'm an idiot. I have a WiP map lying around which I really want to continue, but both the files I can found are playable yet not willing to open in WE (open->crash). Apparently I did some protection thingy to them so that I could share the early versions without having to worry about people changing stuff in them, then deleted the editable copy.
Is there a way I can unprotect it? I don't remember how exactly I protected it, but it's probably very simple since I wouldn't imagine I'd spend too much time on it.
Many thanks :/

While map unprotection is unsupported here...
The best you can do is extract the object data, terrain file, and triggers in jass, with an MPQ editor.

Thanks. I'll try looking into it... and being less delete-happy in the future while I'm at it.