My current top secret assignment is building a micro-site in Joomla! with PDF downloads. The designers sent over the mockups all cosily wrapped up in RAR format. In Ubuntu Linux, I right clicked and selected Extract here. But it didn't, file format unsupported!
This is where the beauty of Linux and the internet comes into play. I searched Google for "ubuntu rar", clicked on the first link (thank you Tombuntu), typed in sudo apt-get install unrar in the Terminal, went straight back to the file on the desktop and extracted it.
How easy do you want it to be?!?