I saw something similar a while back. I used WinRAR (was on a Windows box at the time.. *shudder*) to open the first segment. After that, WinRAR automagically opened all the subsequent 50-some segments and built one big directory with the uncompressed files. Honest.. it just did it on its own. It was beautiful. 🙂
Give it a go. Use a rar tool to start decompression on the first section and see if it does the whole shebang.
EDIT: Actually, I may have selected ALL the segments and told WinRAR to 'Extract'. I don't recall, exactly. Try it a couple different ways. You'll figure it out. It'll do it all on its own.. if you're worthy. 😉