This file assigns the text descriptions to spells that could be bought in Temples (strrefs).
The first column is filled by spells SPL files references.
The second one contains of strrefs to text descriptions of the spells.
In BG1 TotS we have:

2DA V1.0
-1
            DESCRIPTION
SPPR103     19297
SPPR303     19298
SPPR307     19300
SPPR401     19301
SPPR212     19302
SPPR504     19303
SPPR502     44903
SPPR607	    44905
SPPR712	    44907
SPPR713     44909