A software MIDI synthesizer for Windows, which functions as a VSTi plugin. Supports both the Yamaha XG and the Roland GS extensions, which is a unique feature of the S-YXG50. The VSTi was a part of the Yamaha SOL2 package. Yamaha discontinued support of this software synthesizer in 2003. As it is abandonware now, a portable version of the VSTi was created (installation and registry keys are not required). It uses embedded (into DLL resources) official 4MB wavetable files, which is the best version of wavetable files for the S-YXG50.
Yamaha S-YXG50 was released in 1997. First versions were shipped with the simplified 2MB version of the wavetable, and the full 4MB version was published only in 2001. It seems that the cause of this is low amount of RAM in the computers of 90s. Both versions of the wavetable files were created in 1996 (4MB in February, simplified 2MB in July). Possibly, the full 4MB version is a dump of the WAVE ROM of the Yamaha MU80 / MU50 / QS300 / DB50XG / DB60XG / SW60XG / MU10, because the Yamaha S-YXG50 soft synthesizer is very similar to this series of hardware of 1994-1996.