I am attempting to open a dwg file and am getting an error message, "Drawing file not valid". The file was last saved in 2003 and I am taking it off of a CD. I've attempted to use the recover command and have also attempted to find out the AutoCAD version it was created with. When the file was opened with notepad, the file did not start with AC10xx or any of the following:
It doesn't seem like the AutoCAD version should have an effect since it was likely a 2000 or later version.
Is there any other way of recovering the file?
I'm having this problem with hundreds of drawings since last week. All the drawings have had no issues for over 2 years then suddenly this. They are saved and accessed through a Windows Server.