Achievements for Xbox Live for Windows in UE 4.21 or 4.22


Is there any implementation of OnlineSubsystem for Xbox Live for Windows ?
I know that microsoft made UE4 UWP but the development of that branch stopped at 4.19.2 (
Now the windows store allows to submit non-UWP applications to it.
Searching for the native api I’v found that C API exist to integrate Achievements/Presence of Xbox Live for Windows
The link at bottom of the page leads only to git repository that contains C++ UWP API, there is nowhere mention about the mysterious C API that could be used in non-UWP code :confused:

Anyone have any ideas how to approach this ? (or it’s not the right place to ask, and I should asm microsoft instead ?)