It's not for reasons off economy, just the way database/DATs are set up, i.e.:
<manufacturer><system><category>
when you get an open system with no main manufacturer like MSX or 3DO it puts a spanner in the works. Not perfect, but as good as unless we come up with a more robust alternate.
Good remark. Thank you for the explanation, Cassiel.
RE settings, use this (just fill in right hand side header details or copy from existing DAT).
And thanks for this .d2d file, indeed. Much useful.
Greetings,
