Ricardo Bittencourt has released a new version of his emulator, especially conceived for Windows. The emulator still has its limitations (only MSX1 emulation and no sound support), it's still in development though. New feature in version 3.0.g is the possibility of mounting directories.
To get this emulator, you must be a registered member of the Ricardo Bittencourt's Yahoo group: groups.yahoo.com/group/msx-rb/