（WiX） - 使用预构建事件自动生成GUID（heat.exe）

i've made a pre-build event for my directorys/files. now its creating the source.wxs fine, but there are only 'GUID="*"', so now i get compiler error because it is not mapped on ProgrammFilesFolder, but every component needs an unique GUID:i've made a pre-build event for my directorys/f