Please describe the problem:
When installing pygtk from an egg, the gimp windows installer does not detect pygtk

Steps to reproduce:
1. Install gtk
2. Install pygtk from egg
3. Run gimp installer and choose 'customise' python-gimp option is greyed out.

If the steps are repeated but a folder 'gtk-2.0' is created in the Python-Install-Directory\Lib\site-packages then the option is not greyed out and installation is successful (+ PyFu works ok)

Actual results:


Expected results:


Does this happen every time?
Yes

Other information:
The detection is detailed here
https://sourceforge.net/forum/message.php?msg_id=4969570

On my system the file to check for is
pygtk-2.12.1-py2.5-win32.egg

Adding a check for similarly named eggs (which can be files or directories would probably solve this for a lot of people).

Possibly a lot of the people having problems here -
http://www.gimptalk.com/forum/python-and-gimp-t25587.html
are related