makepy generating a file versus a directory

[Olaf Meding]

When does the makepy utility generate a .py file and when a directory?
 And what decided if a directory or a file is generated?

What is the difference between a file and a directory (both named
after the uuid in the IDL file)?

Most of the time the code below generates a file called
BF79B6C5-47BE-11D2-BACD-006008060A3A.py.  But one time it generated a
directory with that same name.  This directory contained several .py
files.

Both the .py file and the directory are generated at:
"C:\Python23\Lib\site-packages\win32com\gen_py".

Here is the Python code:
  from win32com.client import gencache        
  gencache.EnsureModule('{BF79B6C5-47BE-11D2-BACD-006008060A3A}', 0,
1, 0)

Thanks so much for your help.

Olaf