You can access any device connected to your network using some sort of file browser, like ES File Explorer or Total Commander is a good on for this.
You can follow the paths to any device connected by using a File Explore/Manager.
Your MPEG or MKV or the ISO file must be on your network (playing from a BlueRay Player for instance, will not work.. unless it went thru some sort of Media Center/Server type thing).
The File Exploer would find the path you direct it to and once media file is found, then the File Explorer would ask you to select the Player that may be onboard your FormulerZ+ and is capable of playing that media.
If for instance the Player can not play ISO files (which it can't), then you would need to convert them files first. Most Players can play most other formats. The VLC Player is yet to be seen a format it can't play (besides ISO files of course)