Polaroid Cube - No Sound in Premiere Elements

I bought my son a polaroid cube for Christmas a year ago, and for a year it has largely remained unused because of issues with the sound.  There is no sound on the videos when we open the origin file on the PC.  The only way we can get sound to work is to open the file in Windows Movie Maker, save as a new file, and then it will work and the video will play with sound.

A few months ago my son got Premiere Elements and I was hoping Premiere elements would be able to handle/process these files.  It does not.  We get the error:  "The importer reported a generic error" and it can't open up a file directly from the Polariod Cube at all. 

The work around I've found is to open the file in Windows Movie Maker, save it as a new file, and open this new file in Premiere Elements.  However, my son is 10 and he doesn't want to bother with this extra step, so he continues to ignore the cube and not use it. 

Does anyone know of any type of update I might be able to do, either to the cube itself or to Premiere Elements 15, that will resolve this?

thanks!