Not sure, I have never seen these messages before as I would think if it not finding the correct registry version to fire up the Acad session to help translate. I did not know if you meant AutoCAD drawing in your statement. If this is an Inventor DWG file and it was an open from the program then not sure. If this was opened from Windows explorer it could be trying to launch an older version if it was last registered by windows registry. If you do not have multiple versions installed please disregard.