How to see the file extentions
It is important to get your computer to show file extentions so you can tell what kind of file you are about to open. Go to your control panel. (Click on Start, then on control panel, or go to my computer, and click on the control panel. )
In Windows 7 you will need to first click on "Appearance and Personalization"
In windows 7 the control panel looks like this:
CLICK ON "APPEARANCE AND PERSONALIZATION.
CLICK ON "FOLDER OPTIONS"
AT THIS WINDOW CLICK ON THE TAB THAT SAYS "VIEW."
Scroll down to "Hide extentions of known file types.
UNCHECK "Hide extentions of known file types." or
MAKE SURE THIS IS UNCHECKED.
Click "Apply"or"Okay" and that should do it!
Then you will be able to see the file extentions.