I've now had time to start to make some actual tests. This simplest-possible script works in having Poser run a command-line. Windows Notepad opens, the file is not present so is created, and on a save Notepad offers to save it into Poser 11's exe directory.

import poser
import subprocess

cmd = "notepad myfile2.txt"
run_cmd = subprocess.call(cmd, shell=True)

I could be wrong, but I get the feeling that the square brackets and commas are only needed in Python 2.7 and Poser 11 if dealing with file paths?

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Learn the Secrets of Poser 11 and Line-art Filters.