Currently, the documentation on this feature is, eh, minimalistic. I took the time to investigate this feature, including what it does and how it does it.
It's freaking awesome. OK, not 100% of what I want but it has so much that we had asked for. I am now recommending this be added to pretty much all legacy software repackaged into MSIX.
Information on what I found can be found in the white paper here: MSIX InstalledLocationVirtualization (tmurgent.com) .
I encourage Microsoft to please update their own documentation of this feature and maybe make a bit of noise about it.
