V1.74 doesn't officially support mp4, but the WIP v1.745 does.
You can get it from
www.malafe.net (unless you have Comcast which blocks it fo unknown reasons)
If you really don't want to update, IIRC the old version will play the mp4s if you just change the extensions to .avi without recoding.
There are programs out there to automate the process.
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