appEditor provides for efficient and fast viewing, navigation, and editing of the Windows Installer database format (msi, msp, cub, mst). appEditor provides for efficient and fast viewing, navigation, and editing of the Windows Installer database format (msi, msp, cub, mst).The existing Windows Installer database editors range from expensive and slow, to free but under-featured. appEditor loads, analyses and saves Windows Installer databases virtually instantly, while providing all the relationship and structure information that a packager or developer needs in order to understand and navigate the database. appEditor has been designed from the ground up to make editing/validation/viewing fast and easy.