Reading the docs, I'm pretty sure we need a new Py_SetProgramFullPath() function. Py_SetProgramName explicitly is only providing a hint to figure out the file containing the executable, and I really want this to make my new launcher feasible: https://github.com/zooba/cpython/blob/msix/Programs/launch.c

Victor - I've tried for an hour now and I can't figure out where to put this value in all the new configuration stuff. I'm finding it *very* convoluted, with so much copying of config structs and then back-and-forth copying certain values around. Some guidance would be great.