By default when you install Windows you are unable to see file extensions and many people fail to rectify this.
Why would you want to do this:
To differentiate between different file types , bmp , jpeg , doc etc
To know when a file is an . exe , this is where you should be the most wary of running these unknown files , especially if someone has emailed it to you or you have received it from someone.
So how do you do this.
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