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If you get the GUID from the .msi file, you can uninstall the viewer via the msiexec command.
For example: "MsiExec /X{1F20389C-E4CF-4419-9E20-572720AC424C} /qn"
You can use a tool like InstEdit to get the GUID. If you use that tool, you'll find the GUID under the Property table listed as the ProductCode.
You can also get the GUID from the registry as well as the uninstall command that's used by the Add/Remove programs control panel. The registry area is usually HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
Regards,
Dan Nordin