Jeff Johnson wrote in microsoft.public.vb.general.discussion:
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It's a registry setting:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
The value is HideFileExt. Set it to 1 to hide, 0 to show. To force Explorer
to update its display is another matter. Perhaps you could send a
WM_SETTINGCHANGE message.
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I haven't tried this myself. Delphi does have a TRegistry class (You need to include the "Registry" unit in your uses clause) to aid you in your quest. Brian
"There are 2 kinds of people in the world, those that divide people into two groups and those that don't. I belong to the second group." - tag line I stole