It’s rendering (saving) it as

#212894
Avatarrs170a
Participant

It’s rendering (saving) it as an mpeg file because that’s what you told it to render as.
Movie Studio has a number of different render options with mp4 being one of them.
If you haven’t already done so, the manual is a great place to start. Sony has a number of tutorials on their site at http://www.sonycreativesoftware.com/training/moviestudio that are well worth your time watching as you learn the software.

Mike

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