I have read about support of iPhone 8(*), iPhone 8 plus, iPhone X in 0.19 libraw and tried to open photo from IPhone X (.HEIC), but it didn`t open. So I don't understand which kind of extension from IPhone X libraw supports now?
I have an example of picture, but can't attach it here.
HEIC is not raw format, but
HEIC is not raw format, but processed image format (similar to JPEG)
-- Alex Tutubalin @LibRaw LLC