You need a plugin for this
Edit: Works with bms2xtl
Code:
Library loaded: oo2core_9_win64.dll
Streams: 2107 / 2107
Time: 00:00:11 (CPU 00:00:36)
Size: 20.8 MB >> 58.1 MB
Done!!!
Use unreal_tournament_4_0.4.27e_paks_only.bms with the following config
Code:
[Config]
SafeMode=1
UserInput=
Exclude=lzma_dynamic
gzip=zlib
deflate=zlib
zlib_noerror=zlib
deflate_noerror=zlib
oodle=leviathan
Use oodle library v2.9.9
Edit: I see this is a ue5 game with ucas files. I guess you have to use unreal_db maker with key=leviathan setting. I don't have the game so I cannot test.