zip archive open error

GD!

How it's possible to solve this error:
Warning: zip_open() Cannot open zip archive aquarium.zip in /3w/wz.cz/x/xor/bookz/index.php on line 15?1

This one happens during my attempt to read the first entry in each zip file in the specified directory. All filez r text only.

Tnx.
Sorry, forgot to notice:
Webzdarma uses Apache 2.0.52 with php-4.3.2 --with-zip option.
Me to, but Apache 1.3.33, php-4.3.10 --with-zip also...
src zziplib-0.10.82 from http://zziplib.sourceforge.net
src php-4.3.10 from php.net
src apache-1.3.33 from httpd.apache.org
It's again me!
Sorry guys. Now it's ok!
I didn't know that zip_open should be using full-path filename to open.
It's been working without it at home.
Good to know, thanks, I had the same problem :)