If the extension has a toolbar, then it's linked to this problem:
http://www.mail-archive.com/dev@openoffice.apache.org/msg04066.html
Someone has to tweak the extension for 4.0 compatibility.
As a courtesy I have sent a copy of this reply to you as well as to the mailing list.
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Hi,
I'm attempting to use the Magenta Lorem Ipsum extension in OO v.4.0.0 on
Win XP SP, however, it does not work. The extension is clearly visible in
extension manager, and, I have removed/reinstalled/rebooted several times,
but the taskbar shortcut that enables generation of the dummy text that