|In my opinion compression is an abomination. With the size and price of hard drives these days, I don't see any reason to use it. |
Another option is to use Optical media for storage of seldom accessed files.
FWIW to XP users: When you click on the 'Command Prompt' you are just causing the 'Command prompt' to be displayed. This prompt gives you access to NTVDM.EXE, the 'NT Virtual DOS Manager'.