Show file extention

[Nadia]

Hello evryone, Id like to know... how to i get the
extention name after the name of the files,
like list in note book. I want them to show me list.txt
I want to do that for all the files in my computer.
Can someone help me!?
Thank you very much.
Nadia

 

[Erin]

1. Open Windows Explorer or My Computer.
2. On the menu, click Tools--> Folder Options.
3. Move to the "View" tab and look for the "Advanced
Settings" box.
4. Look for an option that reads "Hide extensions for
known file types" and uncheck it.
5. Click "Apply" and then "OK".