Is there any way to export the diff of a MS word document as a patch file?

TortoiseSVN allows you to view changes to MS word documents via some clever VB开发者_开发知识库 scripting (I think). If you try and make a patch file though, you get:

Index: MyDocument.docx
===================================================================
Cannot display: file marked as a binary type.
svn:mime-type = application/octet-stream

Is there any way to create a patch file of the changes which the VBA script could understand?