Most modern hardware video players should open MKV file without a problem. Older players, however, may not recognize a MKV container as a proper multimedia file. In case of players with SMART features it is recommended to install and use VLC Player for play files with MKV file extension.
Some devices may open MKV files but may not play them properly. Most common issues are:
Green screen issue,
Selecting tracks is not possible,
All audio tracks are played simultaneously,
Such errors may occur only with a specific file while other files are played correctly. The best way to overcome such issues is to convert problematic MKV file to MP4 file, which should be opened without any problems.