MKV files are video files which are similar to AVI and MOV formats and supports several different types of audio and video codecs. The MKV file format is an acronym for Matroska Video File.
If you have recently downloaded a MKV file, you might not be able to open it with Windows Media Player. However, there are several other free video players which will allow you to watch movies that have an MKV extension.
In order to watch videos with the .MKV file extension, you should download the VLC player or DivX Player. You can download the above players from the following links:
Once you have downloaded and installed the software, you can then just double click on the MKV file and open it or use the “File -> Open” dialog provided by these players to browse and open your MKV file.
Hope this answers your question. Enjoy your video.