InstallScript Custom Actions

InstallShield 2026

Project: This information applies to the following project types:

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Basic MSI

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InstallScript MSI

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Merge Module

In order to use your InstallScript functions in a Windows Installer installation, you first need to create a custom action that calls your script. The easiest way to create a custom action is to use the Custom Action Wizard.

The primary panels of this wizard are:

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Action Type Panel

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Action Parameters Panel

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Respond Options Panel

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Insert into Sequence Panel

When you complete the wizard, a custom action of type 65536 is created. This custom action type is not defined in the Windows Installer Help Library. Because InstallScript is not a built-in feature in Windows Installer, InstallShield created action type 65536.

Project:You should not use an InstallScript custom action in the User Interface sequence of an InstallScript MSI project. You can use the event-driven script to provide the user interface in an InstallScript MSI project.