Does anyone know of a way to recover a file that throws this error?

"Error opening file filename.musx": -55. After clicking OK a second error message pops up: Cannot delete folder "C:\Users\Me\AppData\Local\Temp\findFB5.tmp\presets".

I have *.musx, *.bakx, and *.asx versions of the file and Finale won't open any of them. My only working backup is about a month old so I'd like to avoid rebuilding all of my work since then, as all of you will appreciate.

Thanks,

Robert Myers