Last week I ended up finding that one of my directories of pictures lost their file extensions – so I thought I’d spin up PowerShell in Win8 and see if I could remember how to do.
After a little trial and error I ended up with the following PowerShell Script – reminded me how powerful and easy PowerShell is for scripting all of Windows.
From cmd.exe, "ren *. *.jpg" will add .jpg to files that don't have an extension. "ren * *.jpg" will replace existing extensions too.