asking about some files in Snowblind

[Drama!]

The wam rls of Project: Snowbling has some strange files on the main directory:
28/02/2005 13:23 155.860.992 XBOX_LD.r01
28/02/2005 13:25 153.202.688 XBOX_LD.r02
28/02/2005 13:27 156.047.360 XBOX_LD.r03
28/02/2005 13:28 155.541.504 XBOX_LD.r04
28/02/2005 13:30 144.011.264 XBOX_LD.r05
28/02/2005 13:31 155.744.256 XBOX_LD.r06
28/02/2005 13:33 155.009.024 XBOX_LD.r07
28/02/2005 13:35 157.231.104 XBOX_LD.r08
28/02/2005 13:36 100.339.712 XBOX_LD.r09
28/02/2005 13:38 155.705.344 XBOX_LD.rkv

they appear to be rar files splitted in multiple volumes, but they are not. They are very strange for a game in its root directory. They have any purpose ?