Best way to create a wix fragment file based on User-defined directories to be used in MSBUILD

Question

In the spirit of this question by Si here: WiX tricks and tips. I am trying to determine the best way to get create wix fragments based on a directories. File harvesting,

Answer 1

The new HeatTasks might work very well for you here. They can pull project output groups from other projects in Visual Studio. It does much better in the latest build than older builds, so be sure to pick up a weekly http://wixtoolset.org/releases/.