DirectoryRef element

In the previous chapter, you saw that to define which directories to copy your files into, you use Directory elements. These take an Id and, if it's a new directory that you're creating, a Name attribute. You can use any of the built-in IDs to reference one of the common Windows directories. For example, suppose we wanted to add a file to the C:\Windows\system32 folder. We'd add a reference to it using the built-in SystemFolder property for its Id:

<Directory Id="TARGETDIR"
           Name="SourceDir">
  <Directory Id="SystemFolder" />
</Directory>

If, on the other hand, it's a directory that you're creating, you can set the Id to anything you like. The Name attribute will set the name of the new folder. After you've defined the directories that you want to use (or create) with Directory elements, you'll use DirectoryRef elements to add components to them.

<DirectoryRef Id="SystemFolder">
  <Component Id="CMP_AnotherFileDLL" 
             Guid...