Thanks for your reply

When using the file-roller I get this message, so apparently it's GUI only:

Code:
** (file-roller:27499): CRITICAL **: Failed to parse arguments: Cannot open display:
And with 7zip I get this:
Code:
7-Zip  4.58 beta  Copyright (c) 1999-2008 Igor Pavlov  2008-05-05
p7zip Version 4.58 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,2 CPUs)

Processing archive: test.iso

Error: Can not open file as archive
Going to try the poweriso thing aswell though