The truth is that it's a pack of tools capable of creating executables of your application's packages. You also have access to a plug-in capable of implementing the software within the 2005, 2008 and 2010 versions of Visual Studio.
This pack of tools can easily be implemented in the different creation processes of software developers thanks to its support for the command line terminal.
The WiX tool pack already includes a full selection of actions that have been implemented by means of extensions. Some of the extensions that it offers support for are Internet Information System (IIS), Structured Query Language (SQL), .NET Framework...
Microsoft is offering you an essential tool to create programs. Create MSI executable files from XML files by downloading WiX for free.