That fiels is for sound ("0xFFFFFFFF" value = no sound). I test this by replacing values and it works. However the sound file must be loaded in that module or to be present in override because if I set a sound which is used in other module will do nothing. I haven't test append new entry but I'm sure is no problem with that. This tool is perfect for what I need to finish my mod.
Many thanks stoffe.
Edit: I just found dialog tool and I should test-it tonight.
I like how easy is to attach scripts for diferite events by editing ar_*.2da files.