Do yourself a really big favor and upgrade your os. Go at least 10.1.5 a free upgrade. OS 10.0 anything is no better than a beta, download an upgrade from apple, or use the software upgrade part of your os preferences. And just kind of informational, a dmg file should not, and as far as I know, can not, be opened in os9,(without additional software). It is a os10 disk copy file and usually contains os10 software.