word document patch

[George Meng]

Hi folks,

Is there any tool out there can do:
1) compare two word documents, one is a old file, the other is a newer
version of the same file.
2) generate a patch, the patch shows the differce between the two files, the
patch suppose to be very small.
3) (Mail the patch to other site of the company) ok, we can do this.
3) (in other site) Update the old file with the patch, and recreate the
newer version file.

Any ideas or tools are welcome.

I did search and found some binary patch software, but all of them actually
create big patch. I can use winzip
to create a smaller file.

George