How to add a command line argument to a steam game?

I have Vampire Bloodlines, and it doesn't start by executing the "vampire.exe" file.

Can't find Steam

I would like to add a -window argument to it, to start in the windowed mode, but the only shortcut that works is steam://rungameid/2600 but it doesn't redirect the command k


Solution 1:

In the Steam Library, right click the game and go to Properties. Click the SET LAUNCH OPTIONS... button, then add your command line arguments in the popup dialog.