[GFocacetti]

UGI – Universal Game Importer

UGI brings the games installed with other launchers into the Steam library as non-Steam shortcuts, live and without restarting Steam: Epic Games, GOG Galaxy, Xbox (Microsoft Store), EA app, Battle.net, Ubisoft Connect, Amazon Games, Riot Client and itch.io. Games added to Steam by hand are recognised too.

For every non-Steam game it adds:

• artwork from SteamGridDB (cover, wide cover, background, logo, icon), with a gallery to pick your own;
• a store-style page in the library (trailers, screenshots, description, reviews, requirements), taken from the game's own store;
• GOG, Epic and Xbox achievements on the game's page, with Steam notifications while playing;
• a collection and a Home shelf per launcher, if wanted;
• launching through the launcher with playtime counted, and the launcher closed again afterwards.

It works in Big Picture with a controller and is translated into every language Steam offers.

Repository: https://github.com/GFocacetti/universal-game-importer

AI disclosure

To be fully transparent: UGI was developed with help from generative AI. I designed every feature, made the decisions on behaviour and UI, and tested each launcher and each change myself on real installs (including multiple friends' PCs), reporting the problems and verifying the fixes. I will maintain the plugin myself. I understand this may weigh against the submission and I'm happy to answer any question about how it works.

Notes for reviewers

• Backend: the standard Millennium Lua backend. Where Lua can't do something it runs Windows PowerShell scripts (written to the plugin's data folder) to read the launchers' files and databases, and compiles two small C# helpers on the user's PC with PowerShell's Add-Type (reading SQLite databases through Windows' own winsqlite3.dll, and finding/focusing game windows). No prebuilt binaries are shipped.
• UI: the game page parts and controller navigation use @steambrew/client components (Focusable, DialogButton, menus). UGI's own page, gallery and dialogs are plain HTML styled like Steam, because they are full windows Steam has no ready component for; I'm open to changing this if required.
• External services: SteamGridDB (free, the user's own API key), the stores' public APIs (Steam, GOG, Epic, Microsoft Store), and optionally RAWG and OpenXBL (free keys) and the user's Epic account for achievements. None is paid and I don't profit from any of them.
• Origin: it started from millennium-uwp-library-sync (MIT) and reuses ideas and code from Steam ROM Manager (GPL-3.0) and steam-easygrid (MIT); all are credited in THIRD_PARTY_NOTICES.md. UGI is GPL-3.0.
• Platform: Windows only for now. Tested on both the Stable and Beta Steam clients.

Task Checklist

Developer

• My plugin complies with the plugin submission guidelines (see the AI disclosure and UI note above)
• I am the original author or an authorized maintainer of this plugin.
• I have complied with all license requirements for the libraries used, including providing appropriate notices where necessary.
• My plugin is fully open source and does not depend on any external paid services, except for widely trusted and well-known platforms. Additionally, neither I nor anyone associated with me profits from any such services.
• Generative AI was used for most of the plugin's code.

Plugin Functionality

• I have tested the plugin on both the Stable and Beta Steam update channels.
• My plugin is unique, or provides additional or alternative functionality to plugins already on the store.

Backend Configuration

• I use a standard Millennium Lua backend in my plugin.
• I use custom binaries that or rely on other FOSS projects that aren't written directly using Millennium's Lua backend. (The PowerShell scripts and the two C# helpers compiled on the user's PC described above.)

Community Contribution

• I have tested and left feedback on two other plugin pull requests.
• I have added links to those feedback comments in this PR.

---

Testing Instructions

• Verified by a third party on Steam Client Stable.
• Verified by a third party on Steam Client Beta.