Playnite – Steam family library integration

This repository contains a GameLibrary plugin for Playnite that adds a new source called Steam Family Group. It aggregates the libraries of the Steam Family Sharing members you configure and keeps their metadata in sync with the Steam store.

Features

• Calls the official Steam Web API (IPlayerService/GetOwnedGames) for every configured SteamID64.
• Merges the responses into a local cache (steamFamilyGamesCache.json) so you can browse the combined collection even when the API is unavailable.
• Imports the games into Playnite with the custom source Steam Family Group and the category Steam Family for easy filtering.
• Downloads descriptions, covers and backgrounds from store.steampowered.com when metadata download is enabled.
• Provides “Install via Steam” and “Play via Steam” actions that launch the official Steam client through the steam:// protocol.

Requirements

1. Steam Web API key (https://steamcommunity.com/dev/apikey)
2. SteamID64 for each account in your family sharing group (you can copy their profile URL and paste it into https://steamid.io to obtain the ID; add one per line or separate them with commas).
3. Playnite 10/11 with .NET plugin support (RequiresApiVersion: 6.11.0). See the official extension docs.

Configuration

1. Open Playnite → Settings → Extensions → select “Steam Family Group”.
2. Paste your Web API key and the list of SteamID64 values.
3. (Optional) Adjust metadata language, price region and request delay if you need throttling.
4. Keep “Download metadata automatically” enabled to pull imagery from Steam.
5. Save and trigger Library → Update game libraries.

Project structure

• SteamFamilyLibraryPlugin.cs: Playnite entry point and library implementation.
• Configuration/: settings model, WPF view and view model.
• Services/: Steam Web API client, metadata downloader, cache and helpers.
• Models/: DTOs for Steam responses and aggregated family data.
• Cache/: serialization helpers for steamFamilyGamesCache.json.
• extension.yaml: plugin manifest consumed by Playnite.

Build

dotnet restore SteamFamilyLibrary/SteamFamilyLibrary.csproj
dotnet build SteamFamilyLibrary/SteamFamilyLibrary.csproj -c Release

Installation

Option 1: .pext package

Check the Releases tab for a ready-made .pext (for example SteamFamilyGroup-v0.1.1-beta.pext). Download it and simply double-click the file

Option 2: manual copy

1. Create a folder inside Playnite/Extensions, for example SteamFamilyGroup.
2. Copy all files from SteamFamilyLibrary/bin/Release/net472/ (SteamFamilyLibrary.dll plus every dependency such as Newtonsoft.Json.dll, System.Text.Json.dll, etc.).
3. Copy extension.yaml into the same folder.
4. Restart Playnite.