Hi, SBT is a complete, functional accounting program written in Foxpro and works well under VFP5, but I don't know if it works with Foxpro 6.
You could go to their website and find out.
By the way, it has been around many years and works very well, and is customizable, as you can get the source code.
I don't remember the URL, but you could search for SBT on a search engine
All the best
Ed