OpenOffice.org uses the term “export” for some file operations involving a change of file type. If you cannot find what you want under Save As, look under Export as well.
OpenOffice.org can export files to XHTML.
In addition, Writer can export to BibTeX (.bib), LaTeX 2e (.tex) and MediaWiki (.txt).
To export to one of these formats, choose File > Export. On the Export dialog, specify a file name for the exported document, then select the required format in the File format list and click the Export button.