Visual Studio 2012 not reading *.sln and *.csproj files

I have been trying to open the Unity 4.3 ProjectName-csharp.sln in visual studio 2012 (vs2012) but vs2012 opens and is blank. Visual studio 2010 reads them just fine. I realized the generated .sln file are inconsistent (i.e. version 11.0 with year 2008) and the .csproj files are also inconsistent (i.e. target version 4.0 with .Net class v3.5). Does anyone know a fix for these problems, or how to get the project to open properly?