MSXPLAYer is an official, commercial MSX emulator created by Bazix developers, released by Stichting Sunrise and the MSX Association. It comes with the MSX GameReader.
Release 1 (09/27/01) (Old, based on intent so it runs without a GameReader)
It plays all but 3 games (FAC demo 5, Sphere, and Magoo's Verticle Sync demo), but has many small glitches with other games. Only ~1/3rd or audio is emulated. The program is completely in Japanese and has very little in the way of configuration: no controller config, no video enhancement options, and no screenshot or savestate support. Also, copies of the emulator are given with MSX GameReaders, and as such it doesn't read disk images: you either need to use real disks or mount images in a virtual floppy disk. It's recommended to use blueMSX over this.
Surprisingly, according to the Japanese Wikipedia page (See below) for MSXPLAYer, this emulator was based on the fMSX emulator.