Critical hits and enhancement bonuses.

[DRAKHOX]

Greetings, one question, do the enhancement bonuses of magic weapons (+1 to +5) multiply with critical hits?

[MrCharisma]

Yup.

Basically all of the static damage (+x) will be multiplied on a crit, but all the extra dice (eg. +xd6, +xd10, etc) will not be. There are exceptions to this, but they're usually called out (eg. an Investigator's "Studied Combat" gives a static bonus to damage, but it's precision damage which is never multiplied on a crit).