I downloaded the NTSC DVD5 from ulozto And I am confused

Part 3 has VTS_01_ fills a VTS_01_5 that is complete and VTS_01_4 that has the end of Luke saying “there” and the beginning of wedge saying sorry. Part 2 has a VTS_01_4 that ends with Luke saying you can’t do any more good. VTS_01_3 seems complete . There is also a VTS_01_2 in part 2 that will not play but is must be related to the VTS_01_2 in part 1 that ends with Han saying Chewie, lock in the auxiliary power.

I am guessing that the

VTS_01_ files have been split ?

Is so how to a fix this if not what is wrong?