ADDLOCAL

The **ADDLOCAL** command is a Windows Installer (MSI) command used during the execution of a setup script to install specific components of a software package. It is primarily employed in Windows Installer XML (WiX) toolset scripts and other custom actions within MSI-based installations to selectively include or exclude features during installation.

When used in a script, ADDLOCAL specifies which features or components should be installed locally on the target machine. This command is often paired with **REMOVE** to uninstall components or **REINSTALL** to reinstall them. The syntax typically follows the format: `ADDLOCAL=FeatureName`, where *FeatureName* is the identifier of the feature or component to be installed.

ADDLOCAL is particularly useful in scenarios where a software package offers multiple features, and users may want to customize their installation by choosing only the necessary components. For example, an application might include optional tools or plugins, and ADDLOCAL allows these to be selectively installed without affecting the core functionality.

In WiX toolset scripts, ADDLOCAL is often used in conjunction with the `<Feature>` and `<Component>` elements to define which parts of the installation should be included. It operates during the installation process, enabling administrators or users to control the scope of the deployment through command-line arguments or interactive prompts.

While ADDLOCAL is a powerful tool for customizing installations, it requires careful configuration to ensure compatibility and avoid conflicts with other system components. Misuse of the command can lead to incomplete installations or dependency issues, so it should be applied with an understanding of the software's architecture and requirements.