To use King.Informix with MapGuide, MAP, Fdo2Fdo you need two steps:
1. Copy KingInformix.dll into FDO folder of MapGuide or MAP.
2. Add an entry into providers.xml.
More in readme.txt
NOTE: Write capability only with Informix Client SDK 3.50!
For FDO 3.4 ( MapGuide Open Source 2.1, Autodesk Map 3D 2010)
For FDO 3.3 ( MapGuide Open Source 2.0, Autodesk Map 3D 2009)
For FDO 3.2.2 ( MapGuide Open Source 1.2, Autodesk Map 3D 2008 )
For FDO 3.2.2 ( MapGuide Open Source 1.2 )