My instruction to unzip multi-parts ZIP archive under Mac OS 8-9 using ZipIt application
http://www.youtube.com/watch?v=V37bL1T-kug
Hint:
xxxx.z01 (is first file)
xxxx.zip (is last file)
1.Start to unpack last file.
2. Next open (by promt) xxxx.z01, xxxx.z02, .... files.
3. And at end once more xxxx.zip file