Do you have one of the databases open in Orca (or another tool) while running 
your code?

-----Original Message-----
From: Powell, Simon [mailto:[EMAIL PROTECTED]
Sent: Thursday, October 16, 2008 6:52 AM
To: General discussion for Windows Installer XML toolset.
Subject: [WiX-users] CreateTransformSummaryInfo Error

Hi,

If I use the following line of DTF code :

    targetDb.CreateTransformSummaryInfo(sourceDb, transformFile,
TransformErrors.AddExistingTable, TransformValidations.Product);

I get the following error :

    This installation package could not be opened.  Contact the
application vendor to verify that this is a valid Windows Installer
package.

The source and Target msi files are very basic (based on Schema.msi).
The only difference in the Target msi is an extra entry in the Property
table.

What I'm ultimately trying to achieve, is the ability to modify existing
MSTs and automate application of our company's packaging standards.

Regards
Simon Powell




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