EasyWell video editor by default supports all the all files that is supported by the Windows Media Player installed on your system, this may differ from system to system depending upon the Codecs installed by the user.

Refer https://support.microsoft.com/en-us/kb/316992 for the the multimedia file types that are supported by different versions of Windows Media Player.

Note: The output of the videos annotated with EasyWell will always be .MP4 (X264)Video file format.