Documentation
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Logging of Action Return Values - Win32 apps
The Installer writes the following values into the log when an action returns these error codes. For the entire list of error codes returned by the Windows Installer function calls MsiExec.exe, and InstMsi.exe, see Error Codes.
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MsiEnableLogA function (msi.h) - Win32 apps
The MsiEnableLog function sets the log mode for all subsequent installations that are initiated in the calling process. (ANSI)
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Enable Windows Installer logging - Windows Client
This article describes how to enable Windows Installer logging.