Richard,
Also be aware that simply turning off "track changes" is going to hide next to nothing.
Every time MS Word auto-saves, or you select to Save the current document, Word simply attaches all the editing changes you have made to the end of the file. So anything that was previously in the file while it was saved, or auto-saved, will still be visible in the file if opened with something like BBEdit Lite.
Only selecting Save As ... and a new file name will mean Word takes the effort to save only what is currently in the document.
MS Word is also famous for saving a lot more into the file that you would think it needs. Computer name, OS, etc. I recently came across some old Word 5 or 6 for Windows documents I'd been working on many years ago, probably from Windows 95 days. My first attempt to open them was in a plain text editor, I was horrified to see all the extra stuff in there.
This did make the news a few years ago, recruitment agencies would use this technique on candidates CV's to see which ones had "enhanced" their previous job history from what was presumably, previously, the truth. It was amazing how many they found that were actually someone else's CV which they had copied and changed the name on.
