How to create patches (Win 95/98/NT/2000)

        Download the Cygwin tool-set  
http://sources.redhat.com/cygwin/

make sure that the 'bin' directory is in your PATH environmental
variable (generally add "C:\cygwin\bin" to your PATH).

type:
diff -u -b old_file(or directory) new_file(or directory) > patchfile

Now you can give people the patchfile and they can use it to create your
new_file(or directory) from the old_file(or directory).