Startup parameters

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Startup parameters can be configured by creating a new shortcut and then adding the appropriate option in the target line.


<program file> -popupwindow -adapter 2

For Steam version:

  1. Choose the game shortcut in Library
  2. Right click on the game
  3. Properties -> General -> Set Launch Options...

Change default to run in 64bit (Windows):

  1. Properties -> General -> Set Launch Options...
  2. Change default executable to the 64bit version: "<path to KSP directory>\KSP_x64.exe" %command%

ex. "C:\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program\KSP_x64.exe" %command%


Here is an incomplete list of available start up parameters:

-popupwindow Enables full screen window mode. "Full Screen" option in graphics settings must be disabled for this to work. This option is also available through the KSP launcher settings. [1]
-single-instance Only allows one instance of KSP. When attempting to launch another instance of KSP, existing instance will become active window. [2]
-adapter Changes preferred monitor for full screen or full screen window. Example: "-adapter 2" [3]
-force-opengl Forces KSP to use openGL [4]
-force-d3d9 Forces KSP to use DirectX9 [2]
-force-d3d11 Forces KSP to use DirectX11
-nolog [2]


  1. Launching KSP in windowed borderless mode. (Make sure you have fullscreen disabled in the game settings) on reddit
  2. 2.0 2.1 2.2 V0.24.0 Multicore processor issues and solutions (x86-x64) on the forum
  3. PSA: KSP in a Borderless Window (Windowed Fullscreen) on reddit
  4. Less memory usage by using OpenGL on the forum

External Links