I had a system crash from a virus and performed a recovery using "system restore" from the day before the crash.
Now when I try to open a drawing (AutoCAD 2012)the error message "drawing file is not valid" appears. I have tried recovering the .dwg and .bak files with no luck. It seems most of my files are corrupted in some way.
When I click on a dwg file to open it no preview is available.
I can open .dwg files from my hard drive that I had zipped through eTransmit command.
If go out to our server (remote) and copy in a previous file that I worked on it will open.
Has anyone encountered this problem?
Frank