actually there a generic split archieve 7-zip unually makes those or a file split after archiving, 7-zip has a beter chence of extracting those correctly though, winrar has a good chance of messing it up

winrar files tend to be named *.rar,*.r00,*.r01,*.r02,*.r03,ect

Bioses

Thats got both sets of bioses in it one is for NullDC think in the data folder, the other ones are Chankast ones