This file defines names of states (like death, poisoned etc....) that are shown in the game message window.
The first column consists of number of the effect, tested it with some effects like slow (40) and Charm Specific Creature (5) and others.
Second column is as it is said - the effect description without effect on game - just for information.
Third column consists of the strref with the name of this effect that is shown in game.
In IWD TotL we have:

2DA V1.0
-1
           EFFECT_NAME STRREF
25         POISON      14017
13         DEATH       14026
12         DAMAGE      14027
68         UNSUMMON    14065