Add a RegistryEntry sub-record to SteamGame record

[Nutzzz]

Parses the Uninstall registry in either HKLM64 or HKLM32 and adds an optional corresponding sub-record

[erri120]

Is there anything useful in the registry that isn't available in the .acf manifest?

[Nutzzz]

Is there anything useful in the registry that isn't available in the .acf manifest?

DisplayIcon, Publisher, and URLInfoAbout (note the last is occasionally blank).

I don't think the others are particularly helpful:
InstallLocation you're deriving by combining InstallationDirectoryName with LibraryFolder. HelpLink appears to always be https://help.steampowered.com. UninstallString is easy to derive from the Steam client exe and parameter "steam://uninstall/{AppId}"

The negative is that if the user has reinstalled Windows, the uninstall entry may be lost even though the games work just fine after it's pointed at the appropriate library location(s).