Microsoft introduced the WinSxS system directory from Windows Vista to store all kinds of files generated during patch update. As a backup, it is convenient for users to restore. Even files that have been replaced by new patches will remain. The direct result is that the folder will expand rapidly, easily exceeding 10GB. Because a large number of system files are involved, if they are accidentally deleted, the system function will be abnormal or even collapse.

If cleaning: it is recommended to use the cleaning tools that come with the system or the third-party software 360 security guards to complete it.