This is purely speculation, but I expect that the live Linux systems you have tried are just seeing the first disk of the RAID array and see enough of a disk structure there that they think they see a partition and files in it, but since the RAID geometry differes from the actual first hard disk that they are not copying files correctly (and will not try to access information beyond that first disk).

As to the drivers, I don't know. I'm not sure if it can be done at all, and if these are Windows drivers and not drivers written for Linux then I would not expect it could be made to work. Even if there are Linux drivers for the RAID controler I would want to find out if they deal with the drive geometry in the same way the Windows drivers do (they very well could, but it is dangerous to just assume that they do).