Hope that helps I believe that the pbxproj is the project file. There are a couple differences here to be aware (but not too many). The simple answer to your question that the .csproj file is the project file equivalent. You can also bundle multiple projects together into a .sln. (BTW, if you open a .csproj with Visual Studio, it normally creates a .sln for you.. lot's of things like Source control are handled in the .sln file)
With these it helps Both machines had WACOM tablet software installed for the artists Centiq's. Removing the Wacom tablet drivers and software fixed the problem immediately. So no more artists with Visual Studio! And no more programmers with tablets!
Is there a way to go to the project containing the file open in the editor in VS2010?