EasyInstall under Windows - strange behaviour

[Norbert]

Hello all,
i try to install ZSI under python 2.5 and windows 2000.
I Downloaded the egg and tried the following

c:\Python25\Scripts>easy_install.exe c:\download\ZSI-2.0_rc3-py2.5.egg

The result is that pythonwin pops up and shows the file :
c:\Python25\Scripts\easy_install-script.py :
----------------------------
!C:\Python25\Lib\site-packages\pythonwin\Pythonwin.exe
# EASY-INSTALL-ENTRY-SCRIPT:
'setuptools==0.6c3','console_scripts','easy_install'
__requires__ = 'setuptools==0.6c3'
import sys
from pkg_resources import load_entry_point

sys.exit(
   load_entry_point('setuptools==0.6c3', 'console_scripts',
'easy_install')()
)
----------------------------

What is going on here ?
I presume that there are some trivial things I don't understand, can
someone provide apointer or hint ?

Thank you for your time !

Norbert