With regards to the Van Buren dialogue files that were posted on DAC earlier today, the eminent JE Sawyer made this comment:
If it helps, I think all of our game dialogues were just compiled Small
scripts with the .dmx extension instead of .amx. Fun fact: every time a
dialogue compiled, the tool would play a five second clip from DMX's
seminal work, "Up in Here".
Hacking our .b3d format might be a bit more difficult, but I hope
you eventually figure it out, if only to see the 15mm ARTEMIS, which
was truly hilarious.
EDIT: Also, I think those Jericho/Mesa Verde dialogues were written by Jeff Husges.
So all you modders out there: get crackin