File Extension Always Changes from .mp4 to .m4z in Media Encoder CS6 Master Collection

Question

Hello,
I am a noob to Adobe products, but I am familiar with video encoding and have been making movies on the computer for over a decade.  I have made several attempts to encode from .wmv to .mp4, but both Media Encoder as well as Premiere creates the output with the .m4v extension.  I am using the H.264 Main, with the MP4 Standard selected in the multiplexer.  I have watched several video tutorials from YouTube on how to make sure I format properly for YouTube in MP4, but I would prefer my file extension to be .mp4 and NOT .m4v.  The name is specified as "video.mp4" but it always comes out as "video.m4v".
I am using the full version (not a trial) of Adobe Creative Suite CS6 Master Collection, Student and Teacher Addition.
Windows 7 64-bit
Before I give all my other pertinent details, or post screen shots (if that is possible), I thought there might be a simple solution.
Can anyone help me?
Thanks in advance

Answer 1

Ok, I found the temporary solution over at this forum posting:
http://forums.adobe.com/message/4717820#4717820.
Over there, I posted this information:
I will have to try keeping the Export Audio box checked.  I am having the same .m4v problem when trying to save as mp4, and my videos have no audio (screen capture tutorials) so I chose not to export the audio.  I will see if keeping the box checked works.
I am using Windows 7 64-bit, CS6 Master Collection Student Teacher;  I just downloaded the full version (paid for) a couple of days ago, so apparently, this is still a bug.
I had posted this same type of question earlier today, now I found this forum.  I don't know if the problem was there before the update because I just bought my Adobe products the other day (November 10, 2012) and installed the updates prior to even opening any single one of the Adobe programs.  Oddly enough, Handbrake does a fine job, so I am using that until I figure out the problem with AME.
UPDATE:
YES!  Keeping that Export Audio box checked resolved the problem.  What I did was (since there was no audio in the original) just take the audio settings down to the lowest possible quality so as to save on file size output.
Thanks for the pointer!