JSI Tip 1347. Office apps don't display file extensions in Open Dialog or Save As?

Example: The Save As Type in Microsoft Office Binder contains:

   Binder Documents   Binder Templates   All Files

instead of

   Binder Documents (*.obd)   Binder Templates (*.obt,*.obz)   All Files (*.*)

You have Hide File Extensions For Known Types checked on the View / Options / View menu
in My Computer or Windows NT Explorer.

If you have Active Desktop installed, use My Computer / View / Folder Options / View to deselect it. On the General tab, toggle your style and click Apply. Toggle it back and click Apply and OK.