GameFinder.RegistryUtils 1.2.0

GameFinder

.NET 5 library for finding games on Windows.

Supported Stores

• Steam
• GOG
• Bethesda.net Launcher
• Epic Games Store
• Origin TODO

Example

var steamHandler = new SteamHandler();
steamHandler.FindAllGames();
foreach (var steamGame in steamHandler.Games)
{
    Console.WriteLine($"{steamGame} is located at {steamGame.Path}");
}

When to use this Library

This library is best used when you have to find multiple different games from different game stores. If you build a tool for only one game then you might better be off finding it via the registry (common method is looking for the Uninstaller). You could still use this library to only find that one game but it's a bit overkill.

If you build some sort of game library manager like Playnite or LaunchBox then you could make massive use of this library.

How it works

Finding Steam Games

Source: SteamHandler.cs

Steam games can be easily found by searching through "Steam Universes". An Universe is simply a folder where you install Steam games. You can find all Universes by parsing the config.vdf file in Steam/config. We can get the Steam folder by opening the registry key HKEY_CURRENT_USER\Software\Valve\Steam and getting the SteamPath value.

The config.vdf file uses Valve's KeyValue format which is similar to JSON:

"InstallConfigStore"
{
	"Software"
	{
		"Valve"
		{
			"Steam"
			{
				"BaseInstallFolder_1"		"F:\\SteamLibrary"
				"BaseInstallFolder_3"		"E:\\SteamLibrary"
			}
		}
	}
}

What we want to look for are these BaseInstallFolder_X values which point to a Universe folder. The steamapps subdirectory contains the appmanifest_*.acf files we need. .acf files have the same KeyValue format as .vdf files so parsing very easy:

"AppState"
{
	"appid"		"8930"
	"Universe"		"1"
	"LauncherPath"		"C:\\Program Files (x86)\\Steam\\steam.exe"
	"name"		"Sid Meier's Civilization V"
	"StateFlags"		"4"
	"installdir"		"Sid Meier's Civilization V"
	"LastUpdated"		"1600350073"
	"UpdateResult"		"0"
	"SizeOnDisk"		"9235434479"
	"buildid"		"4390913"
	"LastOwner"		"76561198110222274"
	"BytesToDownload"		"20736"
	"BytesDownloaded"		"20736"
	"BytesToStage"		"26039"
	"BytesStaged"		"26039"
}

Important in this file are the appid, name and installdir fields. Note: installdir is the name of the folder in Universe/steamapps/common/ where the game is installed. It is not absolute but relative to the common folder.

Finding GOG Games

Source: GOGHandler.cs

GOG stores all information in the registry. This can either be at HKEY_LOCAL_MACHINE\Software\GOG.com\Games or HKEY_LOCAL_MACHINE\Software\WOW6432Node\GOG.com\Games. Simply open the registry key and get all sub-key names. Each sub-key in GOG.com\Games is an installed game with the ID being the name of the sub-key:

Now you can iterate over all sub-keys to get all the information you need:

Important fields are path, gameID and gameName.

Finding BethNet Games

Source: BethNetHandler.cs

Finding games installed with the Bethesda.net Launcher was very rather tricky because there are no config files you can parse or simple registry keys you can open. I ended up using a similar method to the GOG Galaxy Bethesda.net plugin by TouwaStar: GitHub. The interesting part is the _scan_games_registry_keys function in betty/local.py:

1. open the uninstaller registry key at HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall
2. iterate over every sub-key:
   • find the sub-keys that open the Bethesda Launcher with bethesdanet://uninstall/ as an argument

With this you can find all games installed via Bethesda.net. The important fields are DisplayName, ProductID (64bit value) and Path.

Finding EGS Games

Source: EGSHandler.cs

The Epic Games Store uses manifest files, similar to Steam, which contain all information we need. The path to the manifest folder can be found by opening the registry key HKEY_CURRENT_USER\SOFTWARE\Epic Games\EOS and getting the ModSdkMetadataDir value. Inside the manifest folder you will find .item files which are actually just JSON files with a different extension.

See 8AAFB83044E76B812D3D8C9652E8C13C.item for an example file. Important fields are InstallLocation, DisplayName and CatelogItemId.

Finding Origin Games

TODO

Contributing

See CONTRIBUTING for more information.

License

GPLv3.0, see LICENSE for more information.