Dear Sean,
Thanks for the pointers. I have incorporated your plist into my plugin. It did work indeed. I followed this video tutorial online (
http://www.youtube.com/watch?v=GMNSU-PIoOo). Evidently, there is a better way to do this than described in that video.
I also used the hack you suggested to support gzip suffix. As long as the users don't have another gzip qlgenerator in the system, this hack works very well. Even when the users inadvertently try to quicklook a generic gzip file, the quicklook engine will handle the failure gracefully and display the generic gzip icon instead.
Finally, I downloaded and tried your quicklook plugin too. Thanks for making that available. But I needed something that can do a bit more.
Gary