The following Database Functions must never be called from a custom action.

• MsiConfigureProduct
• MsiConfigureProductEx
• MsiCreateTransformSummaryInfo
• MsiDatabaseApplyTransform
• MsiDatabaseCommit
• MsiDatabaseExport
• MsiDatabaseGenerateTransform
• MsiDatabaseImport
• MsiDatabaseMerge
• MsiEnableLog
• MsiEnableUIPreview
• MsiGetDatabaseState
• MsiOpenDatabase
• MsiPreviewBillboard
• MsiPreviewDialog
• MsiReinstallProduct
• MsiSetExternalUI
• MsiSetExternalUIRecord
• MsiSetInternalUI

The following Installer Functions must never be called from a custom action.

• MsiApplyPatch
• MsiCollectUserInfo
• MsiConfigureFeature
• MsiConfigureProduct
• MsiConfigureProductEx
• MsiEnableLog
• MsiGetFeatureInfo
• MsiGetProductCode
• MsiGetProductProperty
• MsiInstallMissingComponent
• MsiInstallMissingFile
• MsiInstallProduct
• MsiOpenPackage
• MsiOpenProduct
• MsiReinstallFeature
• MsiReinstallProduct
• MsiSetExternalUI
• MsiSetInternalUI
• MsiUseFeature
• MsiUseFeatureEx
• MsiVerifyPackage

The following Installer Functions must never be called from a custom action if doing so starts another installation. They may be called from a custom action that does not start another installation.

• MsiProvideComponent
• MsiProvideQualifiedComponent
• MsiProvideQualifiedComponentEx

A custom action should never spawn a new thread that uses Windows Installer functions to change the feature state, component state, or to send messages from a Control Event. Attempting to do this causes the installation to fail.

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Build date: 11/12/2009