These command line parameters are not officially supported but are provided for your convenience.  To use them, input the command line parameters directly into the Command Line field of the launcher.  To access this, launch the game using LANLauncher and then access the Options menu. 

-windowed Run game in a window.

-ignorefocus Don't pause the game if you alt-tab or click out of its window.

-mousefree Allow mouse outside the game window. (Requires windowed mode).

-str Enable single threaded renderer, which may improve performance or compatibility on some systems.

-npd Disable the 'D3D_PUREDEVICE' flag from device creation. May help if you have graphics compatibility issues.

-nosound Disable all sound.

-L Change the language - use English, French, German, Italian or Spanish. E.g -L french

-joysticktype Force a specific directinput controller type. Can be used to try different controller button layouts if your controller isn't specifically supported.