How can I add games or install them to already existing prefixes?

[ghost]

If I wanna for example add a steam game mod launcher to phoenicis,then I want to select the existing prefix.

[plata]

Ok, now I get you're point of specifying the prefix in the wizard.

But: why don't you just run the mod launcher from Steam directly?

[ghost]

why don't you just run the mod launcher from Steam directly?

What do you mean?
If I just open the game,then it doesn't open the mod launcher.

But that was an example,cause I also have non steam games with mod launchers.

[plata]

The best way would be to add a new method prefix() (similar to name()) to the QuickScript. To be used here.
Then the installer for the mod launcher could set the prefix.

[ghost]

What do you mean with that?
Can you give me an example?

[plata]

It could look like:

const SteamScript = include("engines.wine.quick_script.steam_script");

new SteamScript()
    .name("My Addon")
    .editor("someone")
    .author("Toadfield")
    .appId(123456)
    .prefix("my_game");