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 ?
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 ?
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.)