I understand you've ripped an entire Blu-ray disk to your HDD (
without protection).
I don't think you can watch like you can a DVD (with the menues etc etc), but you could (depending on the compression format used) be able to watch the videofiles
(...\STREAM\00000.m2ts 00001.m2ts etc.) which the DVD consists of (i.a. assuming that you allowed - upon installation - BS.Player to internally install the codecs/filters it needs, such as e.g. Haali).
Also assuming you've got an adequate high end CPU and GPU.
Just give it a try and let us know.