Right-click on Command Prompt and select Run as administrator. Locate the Windows Defender Folder: The utility program MpCmdRun.exe is required to run Windows Defender commands.

To run a quick antivirus scan from Command Prompt on Windows 11, use these steps: Open Start. Search for Command Prompt, right-click the top result, and select the Run as administrator option.

The "open" program is specific to OS X and lets you basically drag and drop a file with the -a command onto an application. This way it overrides the per-user OBJ open-with settings.