Error Message says Preview is damaged and can't be opened.

Whenever I try to open a file associated with Preview by double-clicking the file I get the following error message...
If I open Preview first and then open the same file from within Preview it works fine. I've tried going into Info for various filetypes and changing the "Open with:" value to change it to something else then change it back to Preview but that doesn't change the behavior. As you can see in the error message it says "Acorn created this file on August 27, 2014"... no idea what that means. I tried deleting the Acorn app but get the same error message.
Never seen this before and can't find anything specific to this behavior with Preview on these discussions or on the Web. Any suggestions would be greatly appreciated.
Cheers!
Kirk

Hi MBP_Kirk ,
Welcome to the Apple Support Communities!
I know this type of alert can be concerning and frustrating. There is some troubleshooting that I would suggest when you receive an error that an app is damaged and can’t be opened, however. The first attached article explains this alert and the possible cause.
OS X: About Gatekeeper - Apple Support
"Damaged" app. – The app has been altered by something other than the developer. This message will appear no matter the Gatekeeper option chosen.
"App name" is damaged and can't be opened. You should move it to the Trash.
Safari downloaded this file on Date & Time from URL.
For troubleshooting this situation, I would first recommend simply reinstalling OS X Yosemite on your computer. Please use the instructions located in the next attached article to complete this process.
OS X Yosemite: Reinstall OS X
Best regards,
Joe

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