Quietly creeping into Game Pass, it seems that the original PC versions of Mass Effect 2 and 3 are now available on the Xbox app for PC Game Pass. These versions are the ones that run on Unreal Engine 3, the same way they always have been unlock the Mass Effect Legendary Edition which brings the games to Unreal Engine 4 spec and modern consoles (also on Game Pass). Perfect for us that always have a preference for original code.
You can grab the OGs on the Xbox app. Remember that installation of the EA desktop client is required for the games to function.