The page you linked to contains software for the NON-LINUX version of zaurus that came out prior to the linux version in Japan.
It will never run on your machine, the zrs file is the installer from memory and the ba* files contain the program data.
There is no English translation that I know of, probably becaues the MI and PI series zaurus (non linux) were never sold overseas and couldn't be converted to English.
Stu