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I asked my friend what type file he is sending, and he does not know.
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This is actually starting to sound a little odd. Please be certain that it truly is your friend that is sending these files, and not a bad guy who has forged his address. If your friend really did send the file and attachment, fine. If not, delete it immediately. And also note that part of "practicing safe computing" is to scan all attachments for malware BEFORE opening them.
That said, your friend may not know what "type" file he is sending, but surely he should know the program used to make the file - Word, Excel, PowerPoint, WinZip, WinRar, etc. With that information, we can help you with a reader.