Conor, I'd suggest to look at OpenOffice command line interface / calling macros. It can convert many file formats to many others. Then you can pick something much more parse-able than MS doc.
For instance, to convert to PDF, a command line is:
/usr/lib/ooo-2.0/program/soffice.bin -norestore -nofirststart -nologo -headless -invisible "macro:///Standard.Module1.SaveAsPDF(demo.doc)"
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