I added “Configure Form Components”.
and then I added “Installation directory chooser”.
I want to change initial directory when I click button “search” in Initialization script.
It is default of “My document”.

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The initial installation directory can be set with
before the screen is shown, for example in a “Run script” action in the “Startup” node of the installer. The directory chooser of the “Installation directory chooser” form component shows the parent directory of the current installation directory first.