You can view them in Hazel by selecting "other" in the attribute pop-up. There's no single list as it varies on everyone's system based on the apps they have installed.
ok, thanks. Any known way to 'get' to this list in a more comfortable way? Command line or other 'list' command in a way that I could 'grab' with select all & copy?
It is after all a hugely interesting list to become 'inspired'..