InstEd

InstEd screenshots

InstEd is a program that will allow you to create and edit MSI files
Creating a Package
InstEd 1.5 : Creating a Package

Alternative downloads

EMCO MSI Package Builder Professional
Create, maintain and distribute Windows Installer packages.
7.2
Citeknet CAB IFilter
Allows any application relying on IFilters to index the content of Cabinet files.
1.5.3
FREE
InstEd Plus
Allow you to achieve complicated tasks as fast as possible.
1.1.9.10