Visual Studio integration - Use specified .bld file

[kinook]

In the latest download, the addins/extensions for VS 2008 and later have been modified: If a .bld file is saved in the same path as a .sln file with the same base name (i.e., c:\full\path\xyz.bld and c:\full\path\xyz.sln), the add-in will open that .bld file instead of opening the previous .bld file (or creating a new project) and inserting a new step for the .sln file.