VSProlog2012 is the 2012 edition of VSProlog2010. Enable coloring and 'Go To Definition' command while working with prolog on Visual Studio 2012.
If you are working with Visual Studio 2010, you might want to check oout the first version of VSProlog (VSProlog2010). This project does not add any functionality to the product, they are exactly the same, the only difference is the version of VS they run in.
The source code is available at Codeplex
Version 1.7 adds support for *.pl files. It just recognizes them as prolog source files.