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Add Grand Theft Auto IV / Complete Edition support - #242

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vmRyn:feature/gta-iv-support
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vmRyn wants to merge 1 commit into
ModOrganizer2:masterfrom
vmRyn:feature/gta-iv-support

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@vmRyn

@vmRyn vmRyn commented Nov 6, 2026

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Summary

  • Adds a basic games plugin for Grand Theft Auto IV / The Complete Edition (games/game_gta4.py)
  • Supports ASI loaders via forced dinput8.dll / xlive.dll loads, FusionFix/Overloader-aware mod data checking, ScriptHookDotNet / IV-SDK .NET layouts, and Complete Edition save detection under Documents\Rockstar Games\GTA IV\Profiles
  • Updates README supported-games table

Test plan

  • Create a new MO2 instance selecting Grand Theft Auto IV
  • Point at a Complete Edition install (GTAIV.exe, Steam app 12210) and confirm detection
  • Install FusionFix as a mod and confirm dinput8.dll maps from the mod in the Data tab
  • Confirm force-load libraries include dinput8.dll for GTAIV.exe
  • Confirm saves appear from Profiles\*\SGTA4*
  • Install a Fusion Overloader update\ pack and a scripts\*.net.dll script and verify ModDataChecker accepts/fixes layouts

Enable MO2 instances for GTA IV with ASI force-load, FusionFix/Overloader-aware mod checking, and Complete Edition save detection.

Co-authored-by: Cursor <cursoragent@cursor.com>
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