There is this error message everytime one particular CAD file is opened... "One or more objects in this drawing cannot be saved to the specified format. The operation was not completed and no file was created."Tried "AUDIT" command, but didn't help. Thanks,Emmanuel

There are seven possible causes listed for the error at the AutoDesk website.  Start with number one and work your way through each until the problem is solved.https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/Error-One-or-more-objects-in-this-drawing-cannot-be-saved-to-the-specified-format.html

Hello John,Thank you for your reply. It is exactly what I was looking for. I will work my way through the solutions provided in the Autodesk website. Thanks again!