With the Inquiry window you can see if a specific file type is handled by the Quick Look Extension and also if it is supported by highlight
.
Alternatively you can see the UTI of a file with this Terminal command:
$ mdls -name kMDItemContentType -name kMDItemContentTypeTree filename.ext
It's likely that I didn't associate all the possible extensions managed by highlight
.
If you found an unhandled format please send me the output of above command.
Only the formats supported by `highlight` can be managed by this application.