Vim in Microsoft Visual Foxpro
From Vim Tips Wiki
created September 18, 2002 · complexity basic · author Stanislav Sitar · version 5.7
You can tell Microsoft Visual FoxPro to use an external editor for editing project files.
To tell MS VFP to use Vim, use regedit to locate:
and create a new item
with string content
(or whatever your path to Vim happens to be).
This will not replace the internal VFP editor for such things as modifying the "click method" for a button (unfortunately), but when you modify a program, VFP will fire up gvim.