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They are files that have been compressed...regardless of whether it was done by Disk Cleanup or not. By default you have to go into the view settings to enable displaying compressed files in a different color, but that setting has obviously already been turned on.
Unless you're hurting for disk space I would recommend against compressing files...and even if you are hurting for disk space I'd recommending clearing some space by deleting or archiving things to CD rather than compressing. It creates too much overhead when those files are accessed.
I'm a ****ing idiot 'cause I can't make a lamp?
No, you're a genius 'cause you can't make a lamp.
What do you know about trigonometry?
I could care less about trigonometry.
Did you know without trigonometry there would be no engineering?
Without lamps there'd be no light.
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