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In my C:\WINDOWS\ folder there are bmp files called Zapotec.bmp, Soap Bubbles.bmp, winnt.bmp etc. What are they needed for? I was wondering if I can safely delete them?

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They are used as wallpapers in windows. You can safely remove them. If you want to be safe, put them in a folder from where you could restore them afterwards.

Let me ask, why would you want to delete them?

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I was just cleaning up unnecessary files and folders. I deleted KB log files, and I saw them there. My hard drive is working a bit slower nowadays. I want to do a defrag afterwards.. – Caner Jul 24 '12 at 13:07
Those files aren't going to make a significant difference, but they are safe to delete. Deleting hotfix uninstallers will save you a lot more space. If you just want to clean out junk CCleaner is a lot faster, easier, and safer than trying to do it yourself. If you're doing it as a learning experience, by all means go ahead. Then run CCleaner afterwards to see what you missed. – afrazier Jul 24 '12 at 13:55

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