On Windows, config should go into env.AppData

[MicahZoltu]

%AppData% on windows rooms across the network/domain and is more likely to be backed up. For configuration (small user specific files managed by the application), this should go into AppData.

%LocalAppData% is per machine (not synced across network on login/logout), and so cache, program data, and logs are correct to go in there.

[sindresorhus]

Can you link to a source about this?

[MicahZoltu]

Here are a handful of sources, unfortunately not all of them are particularly easy reads. I have included them here in the order that I would recommend skimming over them to get the answers you seek, though if you have a bunch of time you could try to digest them all. :)

https://msdn.microsoft.com/en-us/library/windows/desktop/bb762494(v=vs.85).aspx
microsoft/vscode#3884
https://superuser.com/a/632899/401511
https://msdn.microsoft.com/en-us/library/windows/apps/hh465094.aspx
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-vista/cc766489(v=ws.10)