Editing Presenter 5 files with AP09 or AP13

The specs for Presenter 13 say it can work with Presenter 09 files but no mention of Presenter 5 files. I stopped using AP5 when there were too many problem trying to use it with Win7. So can I upgrade to AP13 and edit those AP5 files or do I have to step them up to AP09 first? If so, how do I get AP09? I don't see it available.

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