What's bibtex? Never mind. You should probably ask its makers, or people
who know bibtex/latex. More of them probably been forced to deal with Word
than the other way around.
Otherwise, you might be able to do something with a complicated catalog mail
merge, if you can get the bibtex database into a format Word's mail merge
will recognize, but that probably wouldn't work for citations, only for a
list of works cited, and sounds like a hassle.
Note that Word itself doesn't have any kind of bibliographic creation
functionality, even if you could get it to recognize a bibtex database.
Third-party software (EndNote, ReferenceManager, ProCite) does that.
These pages suggest the 30-day demo of EndNote might work as a interim step,
or purchase EndNote and use in conjunction with bibtex to have Word
functionality, if you need more than a one-time deal.
<
http://www.umist.ac.uk/departments/library/information/EndNote/bibtex.htm>
<
http://ist.uwaterloo.ca/ew/biblio/bibtex.html>
DM