Does WinRAR Leave Artifacts in Temp Folders that Show Changes to the Archive and Files?
Yes. If a user views archived files in other apps, WinRAR unpacks them to the temp folder in order to be able pass information onto the other apps.
WinRAR deletes these temp files on the following run, when they are at least 1 hour old. WinRAR cannot delete them immediately, because they may still be needed for an external app. If you do not want WinRAR to unpack files to the temp folder, you should not open the archived files in external apps while browsing an archive. You can unpack files to a folder manually, process them as you want and then manually delete the folder.