If you need animated / boned stuff I'd recommend exporting to .X and conversion to .B3D with UUW3D. Blitz supports .X natively too but it's the older DX7 format that doesn't have bone support.
Blitz also loads natively .3DS and .MD2 which could be used theoretically for animated meshes but those formats suck (they are ooooooold) so bad that don't even think about it.
Blitz also loads natively .3DS and .MD2 which could be used theoretically for animated meshes but those formats suck (they are ooooooold) so bad that don't even think about it.