Control Panel/Folder Options, VIEW tab has a checkbox to expose file
extensions of 'known filetypes'
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Mark L. Ferguson
..
"fniles" <fniles DeleteThis @pfmail.com> wrote in message
news:#RfRqG8gIHA.5900@TK2MSFTNGP02.phx.gbl...
> In Windows Explorer, how can you see and change a file extension ?
> Thank you
>