By default, almost all system files, system folders and even Registry keys in Windows 10 are owned by a special built-in user account called "TrustedInstaller". So, once you take ownership and grant admin permissions to a file oe folder, and later want to restore the TrustedInstaller account as the owner, you will notice that it is not shown in the list of accounts. Here is how to restore the TrustedInstaller ownership in Windows 10.
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