The standard order you refer to is true in Linux installation of Perl (or in own-compiled installations of perl)
As I told you, I have Activeperl on Windows XP v5.10.0 build 1003 285500; as you can see also in this post http://www.perlmonks.org/?node_id=704795
in Activeperl the order of the content of @INC is:
C:\>perl -le "print for @INC"
C:/Perl/site/lib
C:/Perl/lib
.