How can a Prism file be identified?

Pirsm files can be identified not only by their file extensions, but also by the contents at the beginning of the file, which serves almost as a signature. Each of the three Prism file extensions has its own "signature":

PZFX: (Prism 5 and later)
FIle begins with a standard xml header:

      <?xml version="1.0" encoding="UTF-8"?>"

Right after that header, you'll see the unique Prism tag:

     <GraphPadPrismFile>  

PZF: (Prism 4 and later)
First 8 bytes are "PCFFGRA4"

PZM: (Prism 3 and earlier)
First 8 bytes are "PCFFGRAF"