The acr
xxx.tmp files are temp files created by Adobe Acrobat. The fact that they accumulate is a known problem; if the number of these files stored on your computer exceeds 65,536, your computer may actually crash when you try to work with PDF documents.
I don't know if there is a way to stop them from being created, but they can definitely be safely deleted. I use a helpful little tool written by called
ATF-Cleaner, which quickly and automatically deletes old files like temp files, cookies, browser cache files, etc.
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Wombat At Large
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since Dec 2003