Don,
You may use MSVC 6.0 but we have found that Harbour/xHarbour and FWH work better if VC 98 is used. I know, it sounds quite strange, but its true
(Microsoft is using .NET on latest versions, turning them more complex internally).
Also, if you ever plan to use xHarbour.com, we also need to build FWH using VC 98 to get full compatibility with it.
The problem is to get VC 98, as Microsoft provided it for free, but its difficult to locate it. The only solution we can offer to you is to provide it to you.