No, there is no file extension and MIME type. Does it actually matter what file extension you use on your server? Also, if you invented your own `text/Golfenstein3D` MIME type, your code can check that your data is transferred using this, but any other machine in internet-land that tried to access your data won't know what the MIME type means, so may not know how to handle the transfer. What problem would that cause? Probably nothing, and you may not want people accessing these data outside of your app.
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