This is not a problem in abrt, the message comes from gvfs-open, which should handle this situation better - like showing a window to select the default application (XFCE does that..)? -> reassigning to gvfs

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gvfs-open is just cmd tool to open file with preferred application or fail. It is up to the application to handle errors gracefully. For example Nautilus offers dialog to choose application. I don't think this is a bug, it is expected behavioral.