You could likely do it with a combination of batch/script and a Macro.
Take a look at "AutoIT" as a possible solution. I've used it to do
multiple search and replace in .PDF files.

http://www.autoitscript.com/autoit3/

kang wrote:

> I have to do some search and replace jobs for bunch of doc files.
> I have a idea to do the jobs in a handy way.
> Convert them to text formats and do the search and repalce jobs and
> convert back to the doc formats.
>
> As I know Word doesn't support the batch converting job, is there a
> utility or something for batch converting?
>
> TIA