All 32 or 64 bit Windows versions, from Vista upwards, are supported. (XP is officially no longer supported but some programs may still work on some XP configurations).
Go here to download some more SoundFonts, including some new ones in the new KompRessed SoundFont (SFKR) format. Also available is the Sonatina Symphonic Orchestra SFZ package compiledby Mattias Westerlund, with samples in OGG format. (SynthFont2 can extract audio from OGG files). Here you can also find the two most common compression programs used: sfArk and sfPack (these cannot extract SFKR).
Go here for a list of sites with more SoundFonts to download.
MidiSoundSynth Version 188.8.131.52 - try it free for 15 days!
You can try the program for free in for 15 days. After that you either uninstall it or purchase a license, which you can do from within the program. For example, a package including a license and the MSSTyrosSF2 GMGS SoundFont from web site MidiSoundSynth for only €23.90!
SynthFont2 and SynthFont2x64 (184.108.40.206) - try it free for 30 days!
Standard users may have Windows set to hide Dynamic Link Library (DLL) files in Explorer. Thus, VST plugin files may not be visible
NOTE 1: VSTSynthFont is provided free of charge by PG Music in their Band-in-a-Box package. Also updates are included in this deal. Here is a short introduction to how to make best use of VSTSynthFont in Band-in-a-Box.
NOTE 2; The VSTSynthFont/VSTSynthFont64 file is not required by SynthFont, SynthFont2 or Viena. You may want it if you have a sequencer that supports VST Instruments.
NOTE 3: VSTSynthFont is NOT JUST a plugin version of SynthFont but a completely different piece of software. Do I need it? If in doubt, search the internet for "VST plugin" or read this..