In the review of Burette a Quick Look extension for chemical filetypes I wrote:-
There are issues with this system, the same file type e.g. .sdf can be opened and viewed by a number of applications, and a given application can open multiple different file types, and different apps might also provide QuickLook extensions. Whilst you can turn off a particular QuickLook extension in System preferences, this eliminates QuickLook views for every file type registered for that extension. I’ve not found a way to assign a particular file type to a particular QuickLook extension.
There is also the issue of file types, macOS uses a combination of Uniform Type Identifier (UTI) and file extensions. Unfortunately this system means that you can have a single file type with multiple entries in the database of UTI.
The day after the review was posted I got a comment on BlueSky
Recently found QuickLookDoctor for setting QuickLook extension preferences. markedapp.com/ql/doctor/
I quickly downloaded it and it is an invaluable tool for setting which Quick Look extension is used for which file type.
