What it sounds like is that you have your system set up so that recognized file extensions are hidden. What you will need to do is open an Explorer window, select the menu option, Tools, then Folder Options. When that opens, select the View tab and scroll down until you see something that reads, Hide File extensions for known file types, and remove the check mark beside it. Close the dialogue box and you should see the file extensions appear. If for some reason you don't, close the Explorer window and open another one.

That should do it. Hope this helps. Jeff Foster, PE CE Group, Inc.

How Can I Recover AutoCAD Autosave Files? Change Autosave. How Can I Recover AutoCAD Autosave Files? Change Autosave File. Change the extension *.ac$ to *.dwg.

Apex, NC RE: Change ext Wincc Flexible 2008 Sp 1200 on this page. ..BAK to.DWG (Structural) 24 Mar 03 10:51.