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As has been mentioned above: A launch file is simply a plain text file which contains valid XML code with valid launch file tags. By convention its file name should end in ".launch" but this is not strictly necessary for it to work.

You say you get an error when you try and launch the file you've made if you can let us know what that error message is, the command you run that produces it and the detail of the launch file you've tried to make. If we know all this then we can help you solve this problem.