Although the player is capable of playing Blu-ray ISO files you shoulf install additional codecs used for image and audio decoding. It's all because of the encoding settings of the Blu-ray ISO image. Please download CCCP codecs and then try to play the ISO file again.
Later Edit: The comment below states that you can not play Blu-ray ISO images but you could try as it has Windows 8 installed and the desktop mode should allow you to install everything I have suggested.