D3D settings

[manwithaplan]

I've looked at different d3d settings in the application database and have a few questions.
1. I dont have a d3d registry key in [HKEY_CURRENT_USER\Software\Wine\Direct3D]
2. I created a .reg file to import and just need some explanation on the values. As posted here is my .reg file for import

[HKEY_CURRENT_USER\Software\Wine\Direct3D]
"DirectDrawRenderer"="opengl"
"OffscreenRenderingMode"="fbo"
"PixelShaderMode"="enabled"
"RenderTargetLockMode"="auto"
"UseGLSL"="enabled"
"VertexShaderMode"="hardware"
"VideoDescription"="NVIDIA GeForce 9600 GT"
"VideoDriver"="nv4_disp.dll"
"VideoMemorySize"="1024"

If I create this registry key is it going to be used, and what is the purpose or effect of "OffscreenRenderingMode"="fbo" Is this enabling framebuffermode?
Also "DirectDrawRenderer"="opengl" does this mean that my D3d settings default opengl?
Just need some clarification on these registry entries, BTW there REG_DWORD entries correct?
And what about the default d3d key at

HKEY_LOCAL_MACHINE\Software\Microsoft\Direct3D

[vitamin]

I've looked at different d3d settings in the application database and have a few questions.
1. I dont have a d3d registry key in [HKEY_CURRENT_USER\Software\Wine\Direct3D]
Also "DirectDrawRenderer"="opengl" does this mean that my D3d settings default opengl?

All your questions are answered here: http://wiki.winehq.org/UsefulRegistryKeys

And what about the default d3d key at

HKEY_LOCAL_MACHINE\Software\Microsoft\Direct3D

What about it? Wine doesn't use it.