Ok, here's the first version of the 64-bit float lib. Just unzip the files into a folder, and put the .decls and .dll in your Blitz+ or B3D folder. It also includes a help file that explains each of the commands. It's pretty limited right now, but I'll be improving on it.
Download Float64 Userlib (37.3kb)
Download Float64 Userlib (37.3kb)