1. Click the "Start" button, type "cmd", and press "Enter" while holding the "Ctrl" and "Shift" buttons. This runs the Command Prompt as an Administrator.
2. Click "Continue" in the confirmation window. If you are not currently logged in as an administrator, enter the administrator password.
3. Type "assoc .EXT=" in the Command Prompt window, replacing "EXT" with the actual file extension. Press "Enter" to remove the file association.
1. Click the "Start" button, type "cmd", and press "Enter" while holding the "Ctrl" and "Shift" buttons. This runs the Command Prompt as an Administrator.
2. Click "Continue" in the confirmation window. If you are not currently logged in as an administrator, enter the administrator password.
3. Type "assoc .EXT=" in the Command Prompt window, replacing "EXT" with the actual file extension. Press "Enter" to remove the file association.