Can you view the file here, using Autodesk's online file viewer? If not, then it's probably corrupt. • Go into the same folder as the DWG file, and look for the same named file, but with a .BAK file extension (You need to have file extension TURNED ON). • This is the last save before your last save. • Then rename that file from BAK to DWG and try that one. • If that doesn't work, then go into your %temp% folder (in the address bar of Windows Explorer, type in %TEMP% and press enter). • Sort by date and look for a file name similar to your original file, but with a .SV$ file extension. • Rename that to .DWG and try it. • This is your last Autosave file (it may not exist) • If that does not work, look for the same named file in the %TEMP% folder with a .BAK file extension. • This will be your next to last autosave file. It may not exist either. • If it does, rename dwg file and try to open it. Source that tell you how to repair dwg file:...