Thanks, much appreciated. Not positive but Skyrim might use the DXGI_FORMAT_R32_FLOAT.
Bethesda gave the community the Creation Kit to mod the game(s), but documentation is sparse to say the least. Gimp didn't support the DXGI_FORMAT_R32_FLOAT, so I was hopeful that paint.net would be a viable alternative. Glad I investigated but even more glad that support will be added for the next version of the plugin. Thanks again.