Here is everything you need to know about what ownership is, why it exists, and how to bypass it safely. Windows uses a security model called Discretionary Access Control (DACL) . Every file and folder has an "owner" (usually the user account that created it) and a list of who is allowed to access it (ACLs).
takeown /f "C:\Path\to\file.txt" icacls "C:\Path\to\file.txt" /grant YourUsername:F
[HKEY_CLASSES_ROOT*\shell\takeownership\command] @="cmd.exe /c takeown /f "%1" && icacls "%1" /grant administrators:F"
Even if you log in as an Administrator, you do not automatically have full control over every file. System files (like C:\Windows\System32 ) are owned by NT SERVICE\TrustedInstaller . If you aren't TrustedInstaller, Windows blocks you. This prevents malware or clumsy users from deleting critical OS files and crashing the computer.