[all variants] UNIX .img extractor/viewer?

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http://ubuntuforums.org – Is there an UNIX .img file viewer and extractor? I have .img files that were made on Windows and older-ish Mac OS (not OSX). A CLI or GUI program would work. I don't care, I'm just having a hard time with these files. I don't want to burn them to a floppy or anything, I just want the files out of the .img file. Any ideas? (Hardware)