A bit late...
L wrote at 2005-08-25 in <news:Xns96BCF388362C5lnllnllnllnlorginval@22.214.171.124>
> I'm trying to script adding a printer but am have trouble finding the PPD.
> A sample script references the ppd file as "laserjet.ppd" but it appears
> that HP's PPDs are all named "printer_model.gz".
Simply copy the PPD in question to another place and uncompress it there
(using gunzip via 'do shell script' or via a simple 'open' call).
> Are the .gz files the new format for printer PPDs?
Nope. But since PPDs are plain text they can be compressed at a high ratio
and therefore Apple decided to store them compressed.