Okay, I've been a bit slow on the uptake...

Of course, each MONST*.DAT file only contains the data for one individual monster.
But here's what I want to do: Imagine an NPC who stays with the party over the course of the game. Let's say he starts at level 3, and goes up to level 10, acquiring a lot of nice weapons in the process.
At the end of the game, I can drop my party members and import them into the next part of the ongoing saga. And I want to export the NPC (and his new stats) along with them.
Are his current stats also saved in the MONST*.DAT file? Because I thought those files would only contain the initial stats for the NPC, not the improved values.