MacPar deLuxe will automatically use unrarX to decompress the files, or split&concatenate to join them if required, it is fully automatic. I don't know if there is anything like that for the PC that automates the entire process.
MacPar deLuxe will automatically use unrarX to decompress the files, or split&concatenate to join them if required, it is fully automatic. I don't know if there is anything like that for the PC that automates the entire process.