Elements 11 doesn’t play sound with AVCHD (.MTS) video files

My Photoshop Elements 11 organizer does not play the sound that accompanies the AVCHD (.MTS) video files that I import from my new Panasonic Lumix ZS50 compact camera. Elements accepts and plays the video clips, but without the sound.

Both Microsoft Media Viewer and my Power Director video editor accept and play these files with sound. (My QuickTime player does not even recognize the AVCHD files at all.)

Of course if I use the other option in my camera -- to shoot MP4 video instead of AVCHD -- it plays with sound in all software.

Thanks for any help in getting Elements to play the sound.

Don