SNF on Windows is 32 bit because most customers still want it that way. We have a 64bit DLL in the SDK. A 64 bit build of SNF generally provides no advantage, but we do have one available if you insist.

All of the pattern matching engines work with single bytes and 32 bit symbols. Making any of those bigger would actually slow things down and waste more memory. So, building SNF as 64 bit only makes the program take up more space.

Linux folks have always built SNF for their platform from source, so 64 bit SNF has been out in the industry for a long time now on some systems (most of our larger customers: ASPs, ESPs, ISPs, etc).