# Costume Quest: Windows x86 functional decompilation

> Costume Quest reconstructs functions from the Windows x86 Steam build 81338 as C++ source intended to match game behavior. The project records original function addresses, marks uncertain or unfinished sections, and builds with xmake and an x86-capable MSVC toolchain using a separately obtained game copy and Steamworks SDK.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/Costume-Quest-Modding/CostumeQuest-Decomp>
- Primary source: <https://github.com/Costume-Quest-Modding/CostumeQuest-Decomp/blob/bca7f602825bb91613b6f533386cd39fc7d1fc24/README.md>
- Catalog page: <https://awesomerea.org/resources/costume-quest-decomp-case/>
- Record JSON: <https://awesomerea.org/resources/costume-quest-decomp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/costume-quest-decomp-case/index.md)

## Requirements & limits

- **Prerequisites:** A legally obtained copy of Costume Quest, Windows x86 Steam Build ID 81338, is required.
- **Prerequisites:** xmake, an x86-capable MSVC toolchain and Steamworks SDK V1.14 are required; the SDK requires a Steamworks partner account.
- **Limits:** Some functions or sections may be marked UNSURE, TODO or UNIMPLEMENTED.
- **License:** The /src game-derived code has no licence; other notice-bearing files use BSD-2-Clause, and external folders have their own licences.

## Primary sources

1. <https://github.com/Costume-Quest-Modding/CostumeQuest-Decomp/blob/bca7f602825bb91613b6f533386cd39fc7d1fc24/README.md>
2. <https://github.com/Costume-Quest-Modding/CostumeQuest-Decomp/blob/bca7f602825bb91613b6f533386cd39fc7d1fc24/CONTRIBUTING.md>

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## 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.