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Here's an alternative to backing out the change, and it's simpler than I expected when I said it would be too much for 3.5.0.
We add an 'arguments' parameter to os.startfile and use that instead of subprocess.call(shell=True). The underlying ShellExecute call does not do any argument processing, so you can pass through any arguments you like.
In the attached patch, I only added the argument for when Unicode strings are used, since byte strings are deprecated, but it's fairly trivial to add it to both. I'll add a backout patch next so they can be compared.