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Fast forward to 2013 and this problem STILL occurs. I didn't feel like deleting the .dwk file, so I changed it to .dwk.old. Sure enough, I was able to open my drawing file. Opening it didn't give me any help at all. The only thing in the file was:
"MAP Lock File 4.0 1 0 0 1382380312 . . "
Whatever that means....
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