Microsoft has informed us of two policies that exist for the OSD that, up to now, had been undocumented. It is unclear when these policies were added, but clearly they are supported in 4.6, and they may have been around for years.
These policies, now documented in The OSD Illustrated (an interactive online application that depicts and describes the entire known OSD syntax) on the TMurgent main website, appear to exist only for extreme debugging purposes.
VIRTUAL_FILE_SYSTEM_DISABLED allows for disabling the VFS, which is responsible for layering virtual application files that should appear outside of the main package install area.
VIRTUAL_REGISTRY_DISABLED allows for disabling the VRG, which is responsible for layering virtual application registry entries over the local registry.
It makes one wonder what else is in there that we don’t know about! As always, if you know of anything not covered in the OSD Illustrated, use the link at the top of the page to send me a note about it.