How to make the.sln files open

How to open .sln files for on my computer it opens a window that says windows could not identify the base program that you wish to open the file with.

You vterens or at least people who have made a game how?

were can I get cause I dont even think that I hane it in the computer

If you read the "Getting Started" documentation we have here: http://nonoba.com/developers/documentation/multiplayerapi/gettingstarted you can see that we list Visual Studio C# Express Edition as available here: http://www.microsoft.com/express/download/