The final option would be to repackage the whole lot into an MSI, thus gaining the silent install/uninstall functionality of an MSI. The other option would be to install using the NSIS and then fashion an MSI to perform the uninstall task only- which you can run silently - which would be a dirty way to do it. The ideal solution to your problem would be for you to contact the software vendor and request that they include in their installation file the silent uninstall mechansim. The functionality is there in NSIS, but has to be configured - if it wasn't, then silent uninstallations will not work. When the vendor created this file it appears they did not include the mechanism for a silent uninstallation. The vendor has chosen to use the Nullsoft Scriptable Install System (NSIS) to create an installation file for the Ogg Codec pack. Just to reiterate what I said in my previous post:
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