Any suggestion on how to import MSVS 2010 solutions (.sln) or VisualC++ projects (.vcxproj) into Dev-C++ 4.9.9.2?
There is an option to import .dsp project files from VS 6.0, but that about all I could find.
The "IDE" doesn't support it in any way, and since development of it stopped a while ago, I imagine there are no plugins that would do it.
You'll have to do it by hand, which probably would also require fiddling with source code, as Dev-C++ 4.9 has terribly old compiler.
I recommend using Visual Studio Express edition, which even in 2012 version will open/convert your projects with ease.