Subject: Re: bug#8541: start-process fails when both the program path and an argument contain spaces

From: Noam Postavsky <[email-masked]>
Date: Wed, 30 Sep 2015 12:29:41 -0400

I believe this was fixed along with #18745 (while searching for it I
happened to stumble upon this one).

A nicer workaround suggested by Eli on that bug is to use w32-short-file-name:

    (start-process "name" "buffer"
                   (w32-short-file-name "D:\\tmp\\xxx yyy\\foo.bat")
                   "yada yada")