So you say you drawing file was fine yesterday but today you can’t open it? Here are some simple tips that may help you open that file. First, search for the BAK file and rename the extension to DWG. If this doesn’t work, then find any temp file (auto.sv$) and rename the extension to DWG. Hey neither of these steps work! If this occurs, then open a new DWG file and insert the desired file and run the audit command (you may have to hit ESC numerous times as this will halt the regeneration process). Finally, if you have about given up, try the recover command.