True, but this version (1.9.7) actually does both sfZ and sf2 soundfont files and says so on the web page I linked to.
I found this version when I couldn't get sfz+ to work and use it specifically for soundfonts. It may be different than the one included with Sonar.
Sfz+ still doesn't work for me in Windows 10 when loading sf2 files. It either says there's not enough memory to load them or else it crashes Sonar. I may try to get another copy from Cakewalk to see what's going on with that.