Two Issues: 1) Possibly, it won't let you load larger SF2 Soundfonts of a filesize bigger than about 500 MB, but well, these extremely large SF Banks are rare anyway.
Very useful for ex., are some cool tweak options you'll have here. Although, I still prefer SFZ (32-bit via JBridge) in my 64bit DAW, its good to have this nice plugin as alternative in your SF2-Soundfontplayer VST folder.
Best free SF2 Soundfont Player in 64 bit and maybe the only decent available.