X7 Some MP4s import without audio

[jkhill74]

I got a new camera Sony's FDR AX100. I copied MP4s from the memory card, to my computer. The files play fine through the Windows 8.1 media player but when I import them into X7 viewing file properties on the MP4s indicate no audio associated with the files. This occurs with both 4K files and 1920x1080 files taken with the FDR AX100. MP4s taken my previous HD camera play through X7 without a problem.

Audio specs for problem MP4s as viewed through Windows Explorer:
Bit rate 1515kbps
Channels 2(stereo)
Audio sample rate 48 kHz

If I view properties through X7 is says:
Audio Type: None

I haven't tried to change audio settings on the camera. This is first use out of the box. Seems to me if Windows can play it, X7 should be able to read and play it as well.

Any thoughts? Anyone? ...Thanks.