WinRAR is available for over a dozen operating systems. It costs $29.00 USD and is distributed as trialware. Even after the trial is over, it is still quite usable, with just a bit of nagging.

WinRAR sometimes produces a string of component compressed files with extensions *.r01 *.r02 etc. when you compress a large file. To decompress, you just open the *.r01 archive, and it automaticaly finds and processes the other pieces. This feature is useful for sending a very large file such as a DVD image to someone over the Internet. You an break it up into manageable pieces and reconstruct them. WinZip Courier limits you to 2 GB (and 100 MB free). WinRAR helps you get around those limits by smashing big files into compressed little ones.