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Setting Game Launch Options Commands
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Setting Game Launch Options
  • Open your Steam Library

  • Right click the game's title and select Properties.

  • On the General tab you'll find Launch Options section.

  • Enter the launch options you wish to apply (be sure to separate each code with a space).

  • Close the game's Properties window and launch the game.
___
Commands
  • -autoconfig - Restores video and performance settings to default for the current hardware detected. Ignores settings inside any .cfg files until this parameter is removed.

  • -dev - Enables developer mode.

  • -console - Starts the game with the developer console enabled.

  • -fullscreen - Forces the engine to start in fullscreen mode.

  • -windowed or -sw - Forces the engine to start in windowed mode.

Screen size
Command
1920x1080
-w 1920 -h 1080
1600x900
-w 1600 -h 900
1366 x 768
-w 1366 -h 768
1280 x 720
-w 1280 -h 720
-fullscreen - Forces the engine to start in fullscreen mode.


Example:
-fullscreen -w 1600 -h 900 to run 1600*900

or -fullscreen /x=1600/y=900
Directx #2 Launch option
-force-d3d9
-force-d3d10
-force-d3d10.1
-force-d3d11
Force a game to run a particular version of DirectX / Direct3D #1

press Windows Key + R to open the Run window, type in
dxcpl
and press Enter.

In the "Direct3D 10/11/12" tab, click "Edit List...", then click the "..." button and browse for the main game executable, then click "Add" and "OK". You can add any executable you want to run with the same settings.

Once done, you'll notice that all the settings in the window are now clickable. Check "Device Settings" on bottom, tick "Disable Feature Level Upgrade", then choose any version you want next to "Feature level limit".
Make sure the version you're choosing is supported by the game, otherwise it won't launch. If the game gives a DirectX fatal error, you may need to use a different version. You can't force versions below 9.

Once done, click OK and launch your game.

turn off third-party launcher (2K games)
--launcher-skip
32/64 bit
/x64 - to run in 64 bit comp.