It's up to Addon developers to submit Addons for the Addon section.

Thanks. It does help to get the name right. But even then searching for it at the extensions web site returns nothing.

It's the add-on to edit regular expressions, not the registry editor. It appeared under General (I believe) when one choose Tools > Options. Disappeared in some update.

Select the Start button on the Windows Taskbar and type Regedit and it should be available to launch.

Do you mean regedit which is a Windows routine? What are you trying to do?

Tired of fruitless searching in this forum and in MM's extensions. Where is regedit?