Hl2 Platformrar -

The file is a collection of essential assets used to port Half-Life 2 to other platforms, most commonly Android . It contains core system files, UI elements, and engine configurations required for the Source engine to run on mobile or handheld hardware. Core Installation Guide (Android/Handheld)

If you recently installed a UI mod (like an HUD or font change), it likely overrode files in this archive. Move your folder out of the directory to see if the game launches. Option 2: The Modder’s Resource hl2 platformrar