We have one Windows 7 system, and I have found that the “C:\Windows\Temp\” directory keeps accumulating files named “cab_1234_5” (where the digits vary rather randomly) at the rate of several per day. They seem to come in groups of 5, about twice per day: the first 4 file are size 0 but the 5th is usually 126 MB. Currently there are about 3180 such files going from today back to 1 Dec 2025. Right now we have about 57 GB of them!
They seem to originate from Windows housekeeping operations. So every so often I Delete (NOT “Trash”) those that are over N months old.
Look at https://learn.microsoft.com/en-us/answers/questions/2557496/cab-x-files-found-in-windowstemp-folder
Those are update files that don’t get deleted after install.