Taking Ownership of a File or Folder from the Command Line, then add group users to all files
To take ownership of a file, run the command:
takeown /F <filename>
In this command, you must replace <filename> with the full file system path to the file you want to take ownership of or relative path .\filename. If the command is successful, you'll see a message similar to the following: SUCCESS: The file (or folder): "filename" now owned by user "Computer Name\User name".
To take ownership of a folder, use the command:
takeown /f <foldername> /r /d y
To get a detailed overview of the Takeown command syntax, run the command:
takeown /?
then add user to all files
icacls .\* /q /c /t /grant Users:F