Hi Nigel,
  Hi. Got myself a load of soundfonts from hammerfall.
I'm ok for
 unpacking the .zips and .rar's on my Linux box, but I've never seen
 .sfArk files before. Is there a tool I can install on my Linux box to
 unpack these? Nigel. 
luckily, yes, there's a (binary only) unpacker; I'll send it via PM.
Best regards
    ce