How can detect filetype for files without extension?


Is it possible to find out type of a file that don't have extension, for example exe, doc, pdf ,...?
Does type of a file keep any other place, for example in header of file?
If no, how can detect type of a file?


  • You can read the beginning of the file and then attempt to detect the file format. Here's a good list of file formats:

    For example, if you want to know if a file is a BMP, then you would check that the file is at least 50 bytes in size, begins with "BM" and so on.
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