How to manually uninstall a notes 8 plugin if uninstall does not work?

I need to manually uninstall a plugin from the notes 8.0.1 client. I have tried to uninstall it using file application application management, but that does not work. (I get error)

Searching my harddrive there is a reference to the plugin in a registry file. but that file should not be edited.

Anyone ?

Thomas

http://www.notessidan.se