Grand Theft Auto IV: The Complete Edition — Steam Launch Options

Set window height

Launch option from Steam Community guide

Uses integrated GPU for battery life (macOS).

Run the game in windowed mode instead of fullscreen

Creates borderless popup window in Unity games.

* : forces lower quality audio, good for lower-end CPUs (removes some extra audio details, not reducing audio quality; reduces CPU load).

Proton/Wine compatibility option.

Forces OpenGL rendering (legacy) in Unity games.

Proton/Wine compatibility option.

Set vertical screen resolution (e.g., -screen-height 1080)

Proton/Wine compatibility option.

Forces Vulkan rendering API in Unity games.

* : forces higher quality audio (default).

Set window width

Proton/Wine compatibility option.

Proton/Wine compatibility option.

Use -availablevidmem XXXX.0

Forces DirectX 11 rendering (Windows only) in Unity games.

Set horizontal screen resolution (e.g., -screen-width 1920)

Set window mode: exclusive, windowed, or borderless

Launch option from Steam Community guide

Forces DirectX 12 rendering (Windows only) in Unity games.