Dls & Program change

Hello! I have a programm in VB6 and DX8, which plays MIDI-files, using GM DLS INSTRUMENTS COLLECTION (about 128 mega). Well, all works properly, but in the moment I''ll try to change an instrument with "SendPatchPMSG" I''ll hear the instrument of GM.DLS and not the sound of my DLS-collection/instrument. Is there a way to address the programm change inside my DLS instrument collection? I''m looking forward to your answer and thank you very much in advance. Kind regards