[64 bit] unzipping files

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http://ubuntuforums.org – Hi there, I recently got some ROM images that are in .zip format for the M.E.S.S. and I am trying to get them to work so I can play some old school games (which I have also the ROM images for). I am trying to get the program to work. It is giving me an error when I try to uncompress the .zip files, here's the error. I get this when I do: unzip 3do.zip OR when I go into my Nautius and I right click it and it comes up in the context menu Extract Here. (NOTE: Using Ubuntu 12.04 with gnome desktop) 7-Zip [64] 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18 p7zip Version 9.20 (locale= (Hardware)