When I open my solution by double click on solution file in a file manager, Visual Studio 2012 asks me whether I want to save devenv.sln:

How can I avoid this annoying thing? (except of opening vs first and than solution – I want just to click a solution file in my file manager).
As indicated here, you have to configure
"C:\Program Files (x86)\Common Files\microsoft shared\MSEnv\vslauncher.exe"to run as Administrator.C:\Program Files (x86)\Common Files\microsoft shared\MSEnv\VSLauncher.exeI also did the same for
C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\devenv.exe.