>>I'm trying learn c#. I intended convert it to c# + xamarin so it would be work in ios + android too. Also resizing is a big problem too. Now it has three edition; desktop, tablet and handheld devices. Handheld devices use remote desktop. Tablets use remote desktop + native (you know there are cheap standard Win8 tablets, we tried and beginned to use, these things are cheap and good with VFP).
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>Afer having viewed the videos on Windows AppX I'm reconsidering the scope. My Clickwork app is currently still windows desktop, but I want to produce a version for tablets and phones too. Maybe I'll gonna stick to the Windows AppX model and not support Android.

Putting to store and multiplatform is just a part of issue. What about automatic screen scaling? VFP doesn't support grid design.