>>So even a containerized Win32 AppX might not run out of the box without changes. In any case, my position stands - VFP apps (and other Win32 apps) may or may not work for ever and a day under Windows 10 if the underlying OS is being changed.

It's the VFP interpreter/runtime from Microsoft that is constrained to Win32, not the apps themselves. Even the busiest VFP app with scx, vcx etc also can be expressed as a flat pseudo-BASIC prg or set of prgs, so IMHO any VFP future is more likely to involve smarter interpreters rather than Windows Goldberg-ism. Nothing new here: 35 years ago a man called "Andy Gariepy" wrote a system that allowed TRS-80 BASIC prgs to run on MS-DOS, Apple II, Mac, TRS-80 and CP/M, delivering blazing ASM performance and 54-digit accurate math along the way. Today we have Lianja and Chen is able to run VFP apps on x64 with no need for the Win32 VFP runtime.

In 2015, IMHO VFP programs are just another sort of 4GL/IL to be consumed by ever-smarter interpreters. The days of OS wars are behind us, destined to be as relevant to consumers as the brand of the freeway blacktop on the way to work. JMHO.