I love how people always claim to "know M$" when in fact they do no research. The Compress Old Files feature in Disk Cleanup compresses files that you haven't touched in 50 days. If you haven't touched it in 50 days, chances are you won't touch it in another long while, and if you do, you were patient enough already to dig it up. It's not meant to be super configurable, just convenient for a single purpose. What do you want to do, heavily compress files? There's a reason Microsoft uses .zip more often than NTFS compression. A lot of reasons, in fact. NTFS compression serves one purpose and one purpose only. Quit yammering. That's because compression is implemented by NTFS, not by the volume manager. It's to be expected. Zip your files or use a sparse archive format if you don't like it. And don't call me a marketroid or any dumb *BLEEP* like that. I'm not selling you anything, I'm just sick of people not knowing what they're talking about. It's driving me bat *BLEEP* insane to see this kind of garbage top Google every single time.