Sometimes really small features that are implemented in add-ins can make developer feel happy. This small features can speed up software development process.
Last time I had to prepare an application installer – I have chosen WiX. In this solution you need to add to each element in installer GUID.
Hopefully I am using R# with Visual Studio 2012. And the R# generates GUIDs out of the box. You only need to enter nguid, press tab button and choose proper format.