combine mp4 files into 1 file

How can I combine a few mp4 files into 1? Any free utilities to do this? I havea Windos OS.
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Timothy McCartneySYS ADMINISTR I INFRASCommented:
Here are a couple of options I've found that would be worth a try.

Timothy McCartneySYS ADMINISTR I INFRASCommented:
The Aimersoft one is unfortunately just a trial, but it looks like the mp4joiner has a free version that should do the trick.
tolinromeAuthor Commented:
sorry I have M4A files not MP4
Timothy McCartneySYS ADMINISTR I INFRASCommented:
I recommend Audacity then. It's an excellent audio file manipulation tool. It can be found at the link below:

Here's a link on how to merge two audio files together:

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