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Possible Duplicate:
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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Huseyin AKSU
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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
  • Possible duplicate of [How do I find out the file type without an extension?](http://superuser.com/questions/435224/how-do-i-find-out-the-file-type-without-an-extension), [How to automatically recover lost file extensions?](http://superuser.com/questions/529435/how-to-automatically-recover-lost-file-extensions), [What utility or method can tell a file type accurately?](http://superuser.com/questions/62901/what-utility-or-method-can-tell-a-file-type-accurately) etc. – Karan Jan 14 '13 at 00:22

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Check out this command line tool:

Trid Tool

Very handy, there is a GUI version as well.

Ofiris
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