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The only way I am aware of to set a default app is when performing an action when prompted for which app to use. There is a spot in Settings to see all Defaults Apps & which actions they are set as default (and I think you can clear the default there also), but I don't think you can pick a default anywhere like you can with Win 10. I think you need to open a file type that the MX Player would open and then when prompted with the Just Once / Always option select always. There might be another way, but I am not aware of it.