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Vista: Show Extensions for Known File Types

I have never understood why Microsoft thinks it is a good idea to hide extensions for files. Here is how to make vista show extensions for all file types.

http://www.tech-recipes.com/rx/1468/vista_show_extensions_for_known_file_types/
1. Click Start
2. Select Control Panel
3. Select Classic View
4. Double-click Folder Options
5. Click the View Tab
6. Uncheck Hide Extensions for Known File Types
7. Click Apply button (at the bottom of the window)
8. Click Apply to Folders button (at the top of the window)
9. Click OK