See the list of programs recommended by our users below. While we do not yet have a description of the EWC2 file format and what it is normally used for, we do know which programs are known to open these files. What is an EWC2 file? Every day thousands of users submit information to us about which programs they use to open specific types of files. KMPlayer is a freeware and supporting 36 different languages with 300 million users globally.