Issue opening alsmost any file

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Wonder if that file "infected" Safari? Have you tried another browser?

If worse comes to worse, assuming either the Recovery Partition is on your internal drive, or better yet, that you can boot your machine from an external device (that's where a product like SuperDuper! comes in handy), you can use Disk Utility to Erase, Format, and Partition your internal drive. Then, do a clean installation of OS 10.10.5 (either via the "full" OS 10.10.5, or starting with OS 10.10.0, and using the Combo Updater for OS 10.10.5). After that, use Migration Assistant to get your stuff from that Time Machine backup. Finally, download and install Safari V9.0.1 (available from here: http://www.macupdate.com/app/mac/15675/apple-safari).
 
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