There use to be an operating system called UNIX where everything storage was treated the same; disks, memory, cache... which is where Pro|E spawned from. Then there was Windows NT which tried to emulate UNIX code (roughly speaking... -v-e-r-y- roughly!) so things could be ported. Today, there are remnants of NT in windows code but new development is not grandfathered in. So even when applications appear to moving forward, those who have not rewritten their kernal to be completely Windooze compliant cannot make use of the Windows background "gadgets".
I know this is a very crude way to spell this out but if you can rise to the 50,000 feet from where this is written, you might get a hint of the history.