Determine An Unknown File Format

If you received a file from someone with an unknown file extension that you don't know how to open it. Don't get stuck. Here are a couple of things you can do to determine the format of a file.

Unknown File Type Identification:

Online TrID File Identifier can determine a file type from its binary signatures. Simply select the file to analyze and in a moment the identification results will be displayed. A GUI version is also available for download in case there is a need to analyze large files.


OpenWith is a small desktop tool that gives detailed information about any file extension and provides links to free programs that can open and create the file. Simply right click on an unknown file and select "How do I open this?". The tool will identify the file extension and suggest the program supporting the file.


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