Runtime Error. Recovery Worksheet Help?

I'm having a runtime error that's crashing MathCAD when I open a worksheet. My google-fu led me to this topic:

http://communities.ptc.com/message/91125

and I downloaded the recovery worksheet posted by Stuart. I'm not getting any results out of it, though.

I placed the worksheet in the same root folder as my file and specified the filename of the file. I tried it with and without the extension, with and without the path and everything inbetween. It doesn't seem to populate. What am I doing wrong?