>http://support.microsoft.com/kb/865219
>
>For Windows Vista, Windows 7, and Windows Server 2008
>
>Start Windows Explorer, you can do this by opening up any folder.
>Click Organize.
>Click Folder and search options.
>Click the View tab.
>Scroll down until you notice Hide extensions for known file types, un-check this line by clicking the check box.
>Note To hide file name extensions, check this line.
>Click OK

Thanks, that works.

I saw Organize but never paid attention to the Folder and search options.