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How do I find out the file type without an extension?

I am wondering if there is any way for understanding for example a file is a video file after we change it's file extension to something else like .bin ?

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marked as duplicate by Karan, Dave M, HackToHell, terdon, Kyle Jones Jan 14 '13 at 8:23

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not sure what you mean, but if you load the file into a text/hex editor you can sometimes tell by the first couple bytes what the file type is... –  Logman Jan 12 '13 at 16:18
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Under unices you have the command file which looks at the magic bytes at the beginning of a file. (You specified windows as OS, so this might not help you but it will help others who search for the same problem.) –  Hennes Jan 12 '13 at 16:38
    

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up vote 1 down vote accepted

Check out this command line tool:

Trid Tool

Very handy, there is a GUI version as well.

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Working like a charm. Thnx –  Huseyin AKSU Jan 12 '13 at 19:32

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