Which one should one use (Win 7 x64)?
226 patch version (gog) D3D9 or OpenGLrenderer
226 patch version (gog) + Kentie's D3D10 renderer
227i Fan patch version D3D9 or openGL renderer

Using Kentie's D3D10 renderer right now plus S3TC textures "High".
Looks and plays great, but I found in video setting neither "Detail Textures" nor "Decals" stay checked if checkedby me; these options are always reset to unchecked. Anybody knowing why? Thanks!

Have switched now to 227i and OpenGl renderer (keeping S3TC High texture packs).
I think this is the best option.