As a service to the rest of the world: just now I had to unzip a file (+/- 200MB), which resulted in a 3.7 GB log file. This needs a 64 bit version of unzip in order to write a file > 2GB. I used HP's C compiler to generate the new unzip, and I thought someone else might find this useful. So, here it is:

Click here to retrieve "unzip_hp-ux_64.tar.gz".