Ian, Find a jpg file, then right click on it. You should get a drop-down menu, and about halfway down is "open with". Select this option, then at the bottom of the drop-down which appears is "choose another app". You should be able to browse to PP (it may need a couple of extra drop-downs). There will be a checkbox for "always use this app for files of this type". Select this. Once you've selected it for jpg, I think it should appear as an option for jpeg, tiff etc.
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