I've been trying to check/create a .sfv file (A .sfv file just contain the filename and crc code next to it (in hex) in Perl here... And it should be easy, but the crc32 modules I use dont seem to generate correct crc for binary! (although they say they support files...)

I can't be sure. But chances are you may need (to read about) binmode, or the :raw layer in open and PerlIO.