AssemblyVersionInfo

I have an existing build server setup using CCNet and I'm evaluating TeamCity.

I have a file which only contains the AssemblyVersion attribute and my current build updates this one file and it affects all projects as its included as a linked file.  I'd like to do the same with TeamCity, but the built in method seems to add this attribute to all my projects AssemblyInfo files.  Is there a way I can tell it the file to modify?