And this from Microsoft ........  
Yukkk   is all  I can say .......   Microsoft Development should be ashamed
of this mess ....

In the document, Word for Windows formatting appears as RTF code. In this
code, style information appears in curly brackets after the "\stylesheet"
label. The following is a sample style definition in RTF format:
{\stylesheet{\s242\tqc\tx4320\tqr\tx8640 \fs20\lang1033
\sbasedon0\snext242 footer;}{\s243\tqc\tx4320\tqr\tx8640
\fs20\lang1033 \sbasedon0\snext243 header;}{\s251 \b\f2\fs20\lang1033
\sbasedon0\snext255 heading 4;}{\s252\li-360\sa120 \b\f2\fs20\lang1033
\sbasedon0\snext255 heading 3;}{\s253\li-360\sb120\sa120
\b\f2\lang1033 \sbasedon0\snext0 heading 2;}{\s254\li-360\sb240\sa120
\b\f2\fs28\lang1033 \sbasedon0\snext0 heading 1;}{\fs20\lang1033
\snext0 Normal;}}
                           
To remove an unused style definition, delete the bracketed information for
that style. For example, to remove the Footer style from the above sample,
delete the following text:
{\s242\tqc\tx4320\tqr\tx8640 \fs20\lang1033 \sbasedon0\snext242 footer;}
                           
As another example, to remove the Heading 4 style from the above sample,
delete the following text:
{\s251 \b\f2\fs20\lang1033 \sbasedon0\snext255 heading 4;}