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From WiX Wiki at MindCapers

Signtool.exe is a command-line tool that digitally signs Windows files, verifies signatures in files, or time stamps files. Note: The Sign Tool is not supported on Microsoft Windows NT, Windows Me, Windows 98, or Windows 95.

Descriptions and Vista

When signing file, use the "/d" parameter of Signtool.exe tool.

signtool.exe sign ... /d "My Description" install.msi

Vista UAC will use this description when asking for elevation instead of the randomly named file.