ICACLS
/t - Recursive
/C - Continue after errors are found

Add user as Owner of a folder
icacls.exe d:\test /setowner domain\username /t /C


Add user/group with Full permissions to a folder:
icacls "C:\Folder" /grant Users:(OI)(CI)F /t /C



Another thing to try (taken from askvg link below):
takeown /f foldername /r /d y
icacls foldername /grant administrators:F /t
icacls "C:\FolderName" /grant Administrators:(OI)(CI)F /t /C

Regedit to add an option to File Explorer:
https://www.askvg.com/add-take-ownership-option-in-file-folder-context-menu-in-windows-vista/


Keywords: Windows, Security, NTFS, File, Permissions, ACL