This file defines the names and descriptions of built in AI scripts for party members. By changing these files one could easily add his own descriptions for scripts.
where:
first column simply is the name of *.BS file that is used
The columns 2-3 contains of the title (name) of the script and description strrefs from Dialog.tlk as the columns are entitled. -1 simply means that given feature doesn't exist (there are no description for example).
In IWD2 we have:

2DA V1.0
-1
           TITLE      DESCRIPTION 
Fighter1   17582      17583       
Fighter2   17584      17585       
Fighter3   17586      17587       
Fighter4   17588      17589       
Thief1     17590      17591       
Thief2     17592      17593       
Thief3     17594      17595       
Thief4     17596      17597       
Mage1      17598      17599       
Mage2      17600      17601       
Mage3      17602      17603       
Mage4      17604      17605       
Cleric1    17606      17607       
Cleric2    17608      17609       
Cleric3    17610      17611       
Cleric4    17612      17613       
+BardSng   32181      32182       
+Thief_S   26853      26854       
+Druid_A   26855      26856       
+Clerc_S   26857      26858       
+Clerc_P   26859      26860       
+Guard     26861      26862       
+Antiund   26863      26864       
+Fgtr_AC   26870      26871       
+Fgtr_A    17582      17583       
+Fgtr_AW   41420      41419       
+Fgtr_D    17584      17585       
+Fgtr_G    26872      26873       
+Cmbtcst   26874      26875       
+Rng_1     33685      33686       
+Rng_2     33687      33688       
NONE       17093      17093       
CUSTOM     17167      -1