Create document with headings 1 to n using the stylist. Now go to Tools |
Outline Numbering. *For level 1 set the Paragraph Style to "none" and Number to
"none". Then for level 2 set the paragraph style to heading 2 and number to
"1,2,3...". For level 3 set paragraph style to heading 3 and number to
"1,2,3..." and so on through the levels required in your document. 

For levels 2 to n, set the after separator to ". " (dot and space) to separate
the numbering from the heading text. Your headings now look for e.g. like:

1.1. Heading 2
1.1.1. Heading 3

etc.

Now save the document in Word XP format and close it. Re-open the same document
again. The headings are now in this format:

.1.1. Heading 2
.1.1.1. Heading 3

etc.

In the Outline Numbering dialogue box the separator that was placed in the
"after" field has been copied to the "before" field also.

*N.B. This corruption only appears to occur if you have set level 1 outline
numbering as described above. If you define level 1 paragraph style as "heading
1" and numbering as "1,2,3,..." then the corruption does not occur.

** N.B. Also occurs in 2.0 beta.