How can I fix the T-SQL editor in VS 2012 after installing SQL Server 2012 SP1?

Question

I can suddenly no longer open .sql files in VS 2012 by simply double clicking in the Solution Explorer. I get the error message:

Unable to open Transa

Answer 1

Yes, yet another bug in SQL Server 2012 roll eyes

Right click on the SQL file and choose "Open With...". Choose "Source Code (Text) Editor" and choose "Set as Default".

Now it works again.