Frustrated when you receive a file that you cannot open on your computer. The first thing you should be aware of is that fact that many anti-virus programs may be blocking it from opening which means the file might be mean little “trigger” just waiting to cause you some harm. Our first reaction will be CAUTION.
If you are sure this file is safe, you might want to consider using on online file conversion website.
Zamzar Online
Zamzar.com has been in existence for well over 15 years and has a great reputation. There is a free version which allows converting files of a certain size. A paid version allows files much larger.