You're using the wrong tools. Through the course of my last major project, we managed to convince the entire team to move to a Wiki scheme. Not only did it make tracking changes faster and easier, but it helped organize the information better. Rather than having to keep track of arbitrary indexes in a large text document, hyperlinks were available between documents.
This meant that the documents could naturally flow from high-level to specifics. Implementation of such specs was incredibly easy in comparison to Word docs. Also, the fact that the docs were in a central location ensured that no one was still working from an out of date copy they saved to their hard drive.
I know there can be some internal resistance to moving in new directions. But if you can convince your colleagues that they should be forward thinking and always challenging themselves, they'll give it a shot and become true believers in no time flat. :-)