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Confirming uploaded file type


HaLo2FrEeEk

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Hey, I have an upload script that I need to be only able to upload two different file types, ppf and sppf, the mime type of which is application/ovtet-stream.  I cannot find a suitable header or footer consistent in all the files, is there any way I can still verify that the files being uploaded are in fact either sppf or ppf, and not simply a renamed exe or some other file?  Perhaps a process of elimination, like checking to see whether it does not have the headers you would expect in other files of the mime type application/octet-stream?  Can someone please help me?

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