How to play MKV files?

Step One :
You need the proper codec to play any kind of video files.
Download from here :
http://www.cccp-project.net/

Step Two :
Click on "Windows Vista/XP/2K" under the word DOWNLOAD.

Step Three :
Click save and it will start downloading.

Step Four :
After the file is downloaded completely, click on the .exe file and follow the installation steps.

Step Five :
When finished installing, right click on the .mkv file you would like to play and it will start playing. If it doesnt, click "Open With" and choose "Zoom Player".

I played a .mkv file and error appeared. I went searching on the net and found this. It helped me, hope it does for you too. :D