verilog mode for xemacs on Windows

[YogS]

Hi All,
I m using Xemacs on windows & for verilog mode I want to do some
modifications. There is a verilog-mode.el placed in directory
xemacs-installation-directory/xemacs-packages/lisp/prog-mode

When I do modifications in this files the modification does not reflect
even after loading the file.
But just to check whether I m picking proper file, I rename that file,
Xemacs cribs for the file.

Any Idea whats going wrong there

Regards
yogS