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If your server is unix then you could try the file command. I've found this very reliable.
From the man page :-
NAME file - determine file type SYNOPSIS file [ -bcnsvzL ] [ -f namefile ] [ -m magicfiles ] file ... DESCRIPTION This manual page documents version 3.27 of the file com<AD> mand. File tests each argument in an attempt to classify it. There are three sets of tests, performed in this order: filesystem tests, magic number tests, and language tests. The first test that succeeds causes the file type to be printed.Maybe File::MMagic is based on the same technology.
In reply to Re: Opinions on determining mime type
by ncw
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