Mkv files now now generate a message that mkv maybe an application.

I have mkv files. I play these files with MPlayerX. A great player that does a excellent job. I have set the mkv files to open in MPlayerX. Until the last week or so the icons for the mkv files looked like the MPlayerX icon. Now they look like a blank icon of a file that is not associated with any program. Also clicking on one for the first time generates a message that the mkv maybe an application. This makes no sense what so ever and is also a recent development. Any ideas as to what maybe going on and how do I get this to stop.

Follow the instructions of tt2 given in https://discussions.apple.com/thread/5822086 and note to run as admin

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Mkv files now now generate a message that mkv maybe an application.

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