Last Error  Cannot start application for the specified document. Check your program associations. Invalid parameter passed to the API function.
When the user tries to open a dwg file from Projectwise, AutoCAD opens with a blank document and then throws error 50002
On ths users system, in Windows explorer, Go to the autocad.exe file, right mouse click properties, Compatibility tab, uncheck "run this program as an administrator."
Note: even if this switch is turned off, there could be third party applications installed that elevate privledges that lead to the same problem. To test for this, open ProjectWise with elevated permissions (browse to pwc.exe and right click-run as administrator) to see if the error still occurs. (PW needs to be at the same privledge level as the application you are opening)
Cannot Start application... Blog
Word or Excel opens as a blank document or error 50002 or 112173