plugin + parse subs under condition else leave to bsplayer

[vooyeq]

im trying to verify subtitles file against a custom condition and if it is fullfilled then parse subtitles myself otherwise let the bsPlayer parse them

when i register *.txt extension and send bsp_LoadSub message I land in my plugin again :/

how can i make the plugin quit parsing the subtitles and let bsplayer do it?