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MSIX & user settings
I was playing a bit with MSIX packaged applications and how they work with user settings (settings stored in HKCU registry or appdata folder) I have locally installed software that stores setting...
By default an app can read from the global registry, which is what an app without a container write to. All MSIX apps share the global registry for reading. This also means group policies function the same whether the app is a legacy installer or MSIX.
An installed MSIX will write to its own virtual registry and app data. This will be deleted when the app is uninstalled or a reset is preformed from the settings app. Other apps will not have access to this information.
John Vintzel (@jvintzel)
PM Lead, MSIX
This article contains more details that complement John's excellent summary:
https://docs.microsoft.com/en-us/windows/msix/desktop/desktop-to-uwp-behind-the-scenes#registry