Sadly, it's not a success report. I failed to create a .fodt file.
The openoffice I'm using reports itself as:
ooo-build 3.2.0.10, Debian 1:3.2.0-9 Sun May 2 18:53:43 UTC 2010
I start OpenOffice writer from the many my window manager provides.
I start mousing around.
I start a new document.
format->page; check footer on
click into that footer.
insert->fields->Page Number
A page number appears at the left end of the footer.
format->paragraph; Alignment Option Center OK
file-Save As
set Name: TestPage
select OpenDocumentText (flat XML) (.fodt)
Save