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dcraw's -4 option results in

dcraw's -4 option results in
- linear gamma (-g 1 1)
- no automatic brigtening (-W)
- 16 bit output (-6)

There is no -4 option for dcraw_emu, but you may use -g 1 1 -W -6 instead.

Fuji X: what exact camera and what Libraw version?

.rawext.tiff - yes, this is intended option to allow convert filename.cr2 and filename.dng in the same folder.

-- Alex Tutubalin @LibRaw LLC