I put the script in the poserScripts folder and called it Testdir.py and this is what I got:

Traceback (most recent call last):

  File "/Applications/Poser Pro 2010/Runtime/Python/poserScripts/Testdir.py", line 7, in ?

    subprocess.Popen(['finder',path])

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/subprocess.py", line 542, in init

    errread, errwrite)

  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/subprocess.py", line 975, in _execute_child

    raise child_exception

OSError: [Errno 2] No such file or directory