Woody --
Thanks for getting back to me.
Well, I re-unzipped the files & re-copied them to my site, & now all is working fine. Got a 'Google XML Sitemap' entry in both the 'Configuration' and 'Tools' menus, the .xml files seem to be generated properly, & all is right with the world.
Go figure. Probably operator error on my part somewhere. I'm just glad it's working.
For the record, I'm running Zen Cart 1.3.0.1, with (I believe) all of the current bug-fixes applied.
The mod is identified as: "// $Id: googlesitemap.php admin page,v 1.0 8/11/2005 bhakala AT pc-productions DOT net".
The set-up is Mac OS X 10.4, Apache/1.3.33 (Darwin) PHP/5.1.2 & MySQL 4.0.21 Complete by Server Logistics.
-- Larry