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From WiX Wiki at MindCapers

Note: When signing an executable file that is larger than approximately 300 megabytes, you should use catalog signing with the MakeCat tool rather than use the SignTool tool. This is because, depending on available system resources, some applications may not be able to verify the binary signature of a large file. For more information, see Knowledgebase Article 922225.

• Sign Tool at MSDN