I have stopped development of this application. But it still works fine under Windows XP...
This tool selects a preset of the MIDI interface MIDI Express XT when Windows is started and another one when Windows is shut down. If you want to disable a function, just set the preset selector to None. The factory preset Direct is not supported as it is not intended for use with Windows.
In case you are a new user of this MIDI interface: the 1.02 drivers for Windows 9x seem to have problems with handling SysEx data, so you might want to use the 1.00 drivers instead.