My mac no longer recognizes file types on my external hard drive

I cannot preview files or open them directly by double clicking or dragging to the app in the dock. it just tells my application not found. I have to open them through the application.
any thoughts?

Hey lorrainefrommalibu,
Thanks for the question. I understand that your iOS devices are not being recognized by iTunes on OS X. The following article may help to resolve your issue:
iOS: Device not recognized in iTunes for OS X - Apple Support
http://support.apple.com/TS1591
Follow these steps to resolve your issue:
If you haven't connected your iOS device to this computer before, unlock the device and tap Trust. Learn more about the Trust This Computer alert.
Restart your iOS device.
Restart your Mac.
Make sure that your Mac meets the minimum system requirements for your iPhone, iPad, or iPod touch.
Install software updates on your Mac.
If an iTunes update is available, apply the update.
Check USB connections. iOS devices need USB 2.0 to work properly. If you're not sure your Mac has USB 2.0 ports, check the computer's specifications.
Disconnect other USB devices and connect your device directly to a USB port on your Mac.
Try another USB cable.
Thanks,
Matt M.

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