# Grand Prix 4 Decompilation: behavior-matched GP4.exe functions

> Grand Prix 4 Decompilation reconstructs GP4.exe functions as C++ and compares each candidate with the original under generated emulator inputs. Its repository includes a function ledger, input layouts and an in-game hook; the author reports 5,669 functions accepted by differential emulation while a playable replacement remains unfinished.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-09
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/leighrobertabbott/decomp-grandprix4>
- Primary source: <https://github.com/leighrobertabbott/decomp-grandprix4/blob/d71cbd42dc2d358c9c716de628871177e7a90ba1/README.md>
- Catalog page: <https://awesomerea.org/resources/grand-prix-4-decomp-case/>
- Record JSON: <https://awesomerea.org/resources/grand-prix-4-decomp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/grand-prix-4-decomp-case/index.md)

## Requirements & limits

- **Prerequisites:** Requires the user's copy of the specified Grand Prix 4 GP4.exe build.
- **Limits:** The author reports 5,669 functions accepted by differential emulation and 306 awaiting in-game checks.
- **Limits:** The reconstruction does not yet build a playable replacement executable.
- **License:** MIT licence.

## Primary sources

1. <https://github.com/leighrobertabbott/decomp-grandprix4/blob/d71cbd42dc2d358c9c716de628871177e7a90ba1/README.md>

## More in Games

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- [Guilty Gear X Plus: decompiling the Korean release](https://awesomerea.org/resources/guilty-gear-x-plus-decomp-case/index.md) · Case study
- [Guxt Decompilation Project: reconstructing the Guxt game source](https://awesomerea.org/resources/guxt-decompilation-case/index.md) · Case study

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.