PY shutil on win xp home version

[jim-on-linux]

python help,

A client is using win xp home.

 my program contains;
   shutil.copyfile(n, 'prn')

This runs fine on win xp pro but they are getting 
the following traceback.

 File "LOP_PRT_10.pyc", line 170, in __init__
  File "LOP_PRT_10.pyc", line 188, in Fprint1
  File "shutil.pyc", line 47, in copyfile
IOError: [Errno 2] No such file or directory: 
'prn'

Since this runs ok on win xp pro, does this have 
something to do with the home version of xp.  

I'm thinking of changeing  'prn' to 'lpt1' and 
trying again but I don't want to  use the client 
as a testor.  Or is there some other explaination 
for the problem.

jim-on-linux