Microsoft keeps more and more under C:\Users\All Users\Microsoft\ClickToRun\ProductReleases (also accessible via C:\ProgramData\Microsoft\ClickToRun\ProductReleases or more precisely %AllUsersProfile%\Microsoft\ClickToRun\ProductReleases).
This can be huge, running into 10s of gigabytes, which – for todays cloud, VM and light-weight device based world – is huge.
Compressing seems to fail for me consistently, as I get “access denied” while compressing when elevating from Windows Explorer.
So this is a reminder to sort this out eventually.
These did not help yet:
I don’t dare deleting it:
Hopefully it is something explainable like the a virus scanner.
Later
Yup: it was the Avira Virus Scanner.
Somehow it has the Windows Explorer UI cause an “Access Denied” message to appear when elevating, but you can still compress files fine in a subdirectory with these steps:
Given a subdirectory named C:\SomeDir\A do this:
pushd C:\SomeDir\A
compact /c /s *.*
cd ..
compact /c A
popd
It is not the first time I bump into Avira stuff (but I only blogged about it once, dumb me: VirusTotal: Avira marks a Delphi built executable als false positive), but the decision of using it was outside my control.
–jeroen
jpluimers commented