Specify whether already-installed versions of the files in the active component (the component selected in the Setup Design or Components view) may be locked—that is, in use by another application—during setup.

If a file is locked during setup or uninstallation, and is in a component whose Potentially Locked property is set to Yes, the file operation is automatically performed after reboot. If a file is locked during setup or uninstallation, and is in a component whose Potentially Locked property is set to No, the OnFileLocked event handler function is called. (The default code for this function automatically performs the file operation after reboot.)

Note that InstallShield always treats shared files as potentially locked files.