Click the "File" tab on the main toolbar and select "Open." Browse for the MKV video in the file selection window. Select the item and click "Open." The media loads in a separate "Now Playing" window.

For example, you could have a device that can only play MP4 videos, and not MKV. To be able to watch your MKV file, you have to know how to convert MKV to MP4 file format.

MKV is an open-source container format that’s useful for storing multiple files using multiple encoding types; many of us use the format when downloading and storing films and TV shows.

Just one wrinkle: I can’t play MKV files from within the WMC interface. In case you’re not familiar with it, MKV is a video-file format like Divx and MPEG-4.

This is the section where you can add input MKV, MOV, MP4, WebM, and other supported format files for processing. Whether you want to join two files or need to split a file, this section includes ...