It cannot delete the temp folders, especially in the windows folder because it is in use. The question is quite straight forward, i need a list of environment variables (which is a fixed list) and is answered by dennis williamson. I always recommend deleting as many files as possible in this folder, as they are only.
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The %temp% in the run command line will show the contents of the logged in user's temp folder.
The temp folder is not always deleted, even after proper shutdowns, and the space can pile up to large proportions.
You don't need to delete the folder itself though, only its content. I wanted to do disk cleanup myself and found a large folder in %localappdata% called temp. You will want to delete all files in the folder and skip anything in use, instead of deleting the folder itself. In theory, appdata's temp folder (%temp%) is the place for programs to put files that can be deleted immediately after all handles to them are closed.
I wondered if deleting the contents of it won't harm my computer. Since windows 11 (or maybe earlier) windows notepad internally stores unsaved files so if the application (or windows) crashes they will be still there later. If the files are in use your delete of them will fail. I've been deleting the temp folder contents since the days of windows 95.
The temp folder is for temporary things.
If you are using windows 7 you. C:\windows\temp there's often 1000's of junk files in those folders, apparently ignored by the disk cleanup tool, so i blindly give 'em the ol' ctrl + a → delete, deleting anything that's not.