Windows Default | Soundfont

The file has been in the same relative path since Windows 2000/XP:

In the late 1990s, Microsoft introduced the "Microsoft GS Wavetable Synth" (GS for General MIDI Standard), which became the standard soundfont for Windows 98, ME, and 2000. This soundfont was more advanced, supporting the General MIDI (GM) standard and featuring a wider range of instruments. windows default soundfont

(Still routes to default MIDI synth.)