Everyting in Windows\temp can be deleted. But some may be in use, so it's good practice to sort on date and not touch everything created today.
Same goes for the files in the Temp subfolder of the Local Setttings folder in your Documents and Settings.
If you use MS Word you might have noticed it uses scratch files starting with ~. Normally, they are deleted if Word closes, but if you find them, it's safe to delete them.
And an extension like .ex_ or dl_ generally is a leftover from some install (they are expended to .exe and .dll, and can be deleted afterwards).
You might like do download free ccleaner to automate some of this deletes.
Hope this helps.
I'm trying to clean up my hard drive...beyond what Microsoft's Disk Cleanup will do. I notice scores of folders in my Windows Temp folder with names "mcu1A.temp", or mcu1B, mcu1C, etc. May I just delete these folders? They contain files named *.mcaf.
Also, in my Windows Temp folder are tons of folders with file names that begin with UPD and end with .tmp. Can i get rid of these?
I've also read an article on CNN's website about cleaning hard drives. In it, its says to search for and delete the following file types: ~*.*, _*.*, *.??_, and *.??~. I understand the use of the asterisks in the search, but what are these files and can I delete them?