You may know that Windows doesn’t grant full file access permissions to users who belong to Administrators and Users group, including file write/modify, delete, rename etc., and the default owner of system files is TrustedInstaller (system user). In order to modify, rename or delete a system file, one needs to follow the default method of changing system file ownership. Today, we stumbled across a nifty file permission utility called WinOwnership, which is designed to let users easily gain full file access control over system files, with a click. All you need is to drag a file over the application, and it tells you whether you have full access to the file or not. You can hit Apply to instantly change the owner of the file. In addition, you can undo the changes anytime you want. The application is particularly useful for those who often need to grant and deny user access permissions to certain files.