Win7
Show File Extensions
[*]Open the Control Panel from the Start menu.
[*]Select "Large icons" in "View by" (right-hand)
[*]Open Folder Options in the Control Panel.
Note: If Folder Options is not available, change View by to Large icons at the top right of the Control Panel.
[*]Select the View tab in the Folder Options window.
[*]Uncheck Hide extensions for known file types.
[*]Click OK to save the changes.
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