Export to .mp4 extension, not .mov

Hi, I am new to PE9 and am trying to save a video to .mp4. I have tried going to Share>Computer>Quicktime and then changing the codec to both H.264 and MPEG-4 codecs, but each time I save it the file extension ends in .mov, not .mp4. Any ideas? Am I doing something wrong or am I asking PE9 to do something it can't do? Or am I supposed to convert .mov file to .mp4?
Thanks for the help

Steve than you so much for your answer! (As I said in another post, I'm buying your book!)
I think I've stumbled upon good camera settings to go with Pre9 in most cases. I'd used the extension switch just for a setting that allowed 640x480 and "decent" but certainly not boradcast quality. I'll move away from that old 4X3 setting to the 740X??? (can't think of it right now,) And I'll keep tweaking .mov settings rather than using the mp4 output.
It's frustrating that most producers and talent agencies insist on only .mov files! I think the 15meg limit they mostly insist on is a limitation as to their emails back and forth with producers more than anything else. Some are using YouSendIt for files, but still want it under 15megs. (Sigh)
I'm only using Pre9 to go from avchd through editing and output to either mp4 or .mov and sent a test to another pc.
The mp4 file in the sheep's clothing of .mov played fine, but I hear ya as to it being a potential problem depending on what others use to playback the file.
Thanks again, I'm sure I'll learn tons from ya sir!

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http://www.techspansion.com/visualhub/
claimes export to Playstation.. free trial..

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Export to .mp4 extension, not .mov

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