"widget with assets" is impossible on Windows

[CamiloMM]

I get an error such as:

POST http://localhost:55500/sock/069/7ivl2kmx/xhr_send 500 (Internal Server Error)

And since this is after a series of hurdles (I think many NodeJS modules are just plain FUBAR on Windows), I just give up trying. If someone on Windows managed to make this pass, tell me how, please.