This isn't the case nowadays. soundfonts are similar to Reason refill format. A file that contains the audio samples and the patch files, although the refill format is a bit more diverse. Most programs can handle soundfonts, Kontakt 2, and i believe Rapture and Dimension Pro can also import soundfonts. There a couple of free VSTi's that can also import soundfonts, i forget their name at the moment though .