Hi Tomasz,
as far as I know, Mediawiki 1.17 seems not being compatible with the
DumpHTML extension (we have here at least a problem with CSS files).
Consequently, nobody (me included ;) will be able to make HTML dumps
with an uptodate Mediawiki PHP code as soon as this released will be
rollouted on WMF servers.
Do exist plan to avoid this future issue?
Regards
Emmanuel