https://bugs.winehq.org/show_bug.cgi?id=47580
--- Comment #8 from Eric Gillespie brickviking@gmail.com --- Yup. Step I missed was: install git-lfs, then do "git lfs install" from within the Dolphin directory, and "git lfs pull". Disregard the previous request for the DBOOT.img7 you have, it'll be a "lfs pointer" to the real file up on github's Large File Storage.