Mac Mini OS 10.5.8 will not install .pkg or .mpkg files

Reciently my Mac Mini has been prompting me to "choose an application" when I try to install .pkg or .mpkg files. This is preventing me from installing any new software on my computer. I've tried to repair permissions and that didn't help. I also tried to reinstall my OS from the disk that came with my computer. When I attempt to reinstall, my mac restarts and spits the disk out and no changes are apparent. What can I do to fix this?

Welcome to the Apple Discussions!
Those packages are opened with the Installer.app. Perhaps it has become disassociated from these types of files on your Mac. To install, next time it asks you to choose an app, browse to the Installer and choose it. It is in Apps/Utilities.
To permanently fix this issue, right click on a pkg or a mpkg file and select Get Info. In the Get Info window go to the Open with pane and choose the Installer as the correct app to open these files. Then press the Change All... button.
Dah•veed

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