The subject line says it all. That is the error message I now get when trying to load the file.  

I had SW hang up and die during a save and the file ended up corrupt.  The preview image is cut off on the bottom, as if the graphics routine died while writing the image. 

It was the only file being worked at the time.  It's just a part file of an aluminum extrusion with machined features. I was using dimxpert for the first time and trying to save the file with the dimensions.

I have the file saved off as step and stl files, but no immediate backup - the backup I do have will take some work.  And I have a design review this week.

I've attached the file