Thanks for the link, although i have tried every single exporter out there.
I have solved my problem though, after a few hours of searching and reading. The blender SMD export script that Hellequin has made for us a while back works perfectly.
The problem was that some new items (i was editing a horse) have actual bone names and not numbers, whereas OpenBRF only seems to understand bones when they are numbered (0-27 for a horse). It does take a while renaming each of the 28 bones in a horse rig, because each number is associated with a bone, getting them wrong results in bones being in the wrong place. Now i got a new rigged horse in the game though.
and again thanks for the tutorial