- Open Control Panel
- Select Appearance and Personalization or you may be able to jump to Folder Options or File Folder Options.
- Select the View tab
- In this tab, under the Advanced Settings field uncheck the option: Hide extensions for known file types
- click Apply and OK
- Right click on the file in Windows Explorer
- Select Rename
- Delete the extension file text until it says hosts
- If you are prompted to continue say yes.