The file in question is http://releases.ubuntu.com/9.04/ubuntu-9.04-alternate-amd64.iso
The 7-zip versions I have encountered this bug in are both 4.65 and 9.10 (beta), Windows 32-bit.
The displayed filenames when running "7z l", as well as in the 7-zip file explorer are truncated to the first 64 characters in the filename.
Examples (these should all end in .udeb, but are listed as follows)
The issue is with filename length, not path length, since long paths with a filename of length less than 64 like pool\main\l\linux-backports-modules-2.6.28\updates-modules-2.6.28-11-generic-di_2.6.28-11.12_amd64.udeb are correctly listed.