At the recommendation of Sony technical support, I’ve downloaded and installed the Morgan M-JPEG codec V3 but still no success regarding the audio track. I was, however, able to use a different program to extract the audio track from my file to use it as a separate file. I’m afraid this isn’t a great way to proceed and will ultimately complicate the editing process, though. I used the GSpot program and, if I read the results correctly, the file is an AVI-Type 1.