After downloading, these files ought to play on a Windows laptop simply by double clicking them, but you could be way more productive when you load them into a midi editor. VSDC Free Audio Converter has a tabbed interface that's uncomplica…

Which allows you to take any midi file, add it, have each midi instrument get replaced with a better quality soundfonts (basically recordings of actual devices playing the various notes ordered which can then be read and used by a software…