How can I view my .m2ts files in Windows Media Player?

Maybe video format issue, Windows Media Player can't support all m2ts file, it just supports some special mp4, such as mp4(avc video codec, aac audio codec) video, so I think you just need a right converter to convert m2ts to Windows Movie Maker, then you can put the converted video into Windows Movie Maker program. I am using iSkysoft Video Converter which can do this well, it also can convert any videos or audios between different formats, have a try by yourself. You can yahoo or google search and download it, hope it can help you.