I installed Bugzilla 2.22.1 with success, but it doesn't work, and
In error.log(from Apache) appear:
couldn't create child process: index.cgi.
couldn't spawn child process: C:/Bugzilla/index.cgi


The solution was change the header of the index.cgi file:

The original header is:
#!/usr/bin/perl -wT

I substitute it with:
#!C:\Perl\bin\perl -T


my question is:
why It works if I don't change the headers of the others .cgi files?