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« on: June 30, 2015, 09:07:51 »
One solution to making it usable on higher DPI displays is to use a resolution about quarter the size of the screen's native one and blowing it up with the x2 selection. Unfortunately halving your vertical resolution of 768 gives 384 which is less than Milky's minimum of 480. Meaning with x2 you will always get a window 960 minimum and it won't fit on the screen.
The other, as you said, is using fullscreen. The unrecognized resolution thing will happen with most arbitrary resolution settings but how about your bog standard 640x480 or 800x600? Will your tablet fullscreen even those? If so, that's a good sign. You could use the Windows Display settings Resolution selector as a list of resolutions worth experimenting with.