Build Version Increment Add-In Visual Studio
Somehow Visual Studio doesn't come with an option to only auto increment the build version of the AssemblyFileVersion attribute. Sure, by placing an * in the AssemblyVersion attribute and leaving the the AssemblyFileVersion out the compiler will auto generate build versions for both but this is a pain to maintain when you're releasing signed assemblies. Besides I don't feel like grabbing a calculator just to see when version 1.0.3394.25054 has been build. I needed a little more control.
I found use full addin for visual studio on codeplex. Click for more details.