InstalledLocationVirtualization is an important feature Microsoft added to MSIX that aids in the compatibility of Win32/DotNetFramework software packaged into MSIX.
There is little documentation on what this feature does, but it exists on most production system today and we should be using it.
After some research into this feature, which I document in this White paper, I believe that …

PsfTooling is the free tool to work in conjunction with the Microsoft MSIX Packaging Tool. 
The Package Support Framework (PSF) was originally an open-source project to help Win32/DotNet applications run when inside an MSIX Container. TMurgent has taken up the support for the PSF in our own fork 