Error message: "drawing file is not valid"

[maxencefonta]

I'm using version 2004. A friend sent me two files (generated by someone other than him).
When I tried to open the files in version 04 (which is what I use)... I've got the same error message (drawing file is not valid).

Any help would be appreciated. Thank you.

 

[smog0]

maybe those files were created with a newer version of the software