This looks like a large change but the relevant change is binka_ue_file_header.h. Then rebuilt libs, and a bunch of source changes that never made it over in the initial checkin.
#jira UE-119962
#preflight 60fb20bc391d460001ff28a5
[CL 16942270 by Dan Thompson in ue5-main branch]
Unreal part of the decoder, linking against the SDK from checkin 1/4. This code handles the file/block parsing, as well as seek table access.
[CL 16677900 by Dan Thompson in ue5-main branch]