(Solved) - Safe to delete files in C:\Windows\winsxs\Backup ?(5 posts)
Nope. Those files are used for running programs with different levels of system compatibility. The winsxs directory stores copies of system files, including ones that are downlevel but are still use by some applications or parts of the operating system. These are system files, which are considered to be part of the OS so deleting those files is like deleting files in C:\Windows\system32 -- not safe, and eventually disastrous. Here is some further reading but it's pretty dry stuff! The last one shows what can happen if you do delete from there.
"In Vista, 'Windows File Protection' has been replaced with 'Windows Resource Protection' which, essentially performs the same function. The 'dllcache' folder no longer exists in Vista, it has been replaced with the
%systemroot%\Winsxs\Backup folder. This folder is NOT 'a backup of a backup', it exists only to make sure that files required for Vista to boot and operate are protected."
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