Home : Tutorials : Microsoft Windows Vista : Show hidden files and folders/Unhide file extensions.
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1) Single left-click on the Start button.

2) Single left-click on Computer on the right side of
the menu that pops up.

3) Single left-click on Tools from the menu.

4) Single left-click on Folder Options...

5) Single left-click on the View tab.

6) Single left-click the circle next to Show hidden files and
folders.

7) Uncheck Hide extensions for known file types.

8) Single left-click OK to exit Folder Options
or Apply to make the changes without exiting this screen
.