Good to know. On a separate issue, I’m trying to debug the XSAPI and REST code, which are DLL’s, and have them added to my VS Solution:
https:///Microsoft/xbox-live-api/blob/master/LINKTOSOURCE.md#how-to-link-against-the-xsapi-winrt-uwp-source
My build output is: <Game>\Binaries\UWP64\AppX\Engine\Plugins\Online\XboxOne\OnlineSubsystemLive\ThirdParty\XSAPI\UWP.2017.07.20170710.01\lib\x64\v140\release
After pressing F5 in VS the REST DLL is overwritten from the script:
How can I disable the overwriting? Possibly rename the source folder 
Also, I noticed that the source folder already has the PDB present for both DLL’s:
Engine\Plugins\Online\XboxOne\OnlineSubsystemLive\ThirdParty\XSAPI\UWP.2017.07.20170710.01\lib\x64\v140\Release
Are these coming from a Microsoft Server?
[EDIT]
I see the D appended to the REST DLL (cpprestd_uwp_2_9.*).