https://bugs.winehq.org/show_bug.cgi?id=47580
--- Comment #7 from Eric Gillespie brickviking@gmail.com --- $ ls -l DBOOT.img7 -rw-rw-r-- 1 viking viking 1450668 Jul 23, 22:16 DBOOT.img7 $ hexdump DBOOT.img7 | head -n 1 00000000 5349 0054 0007 07e0 0000 0000 0000 0000 (bytes within pairs are swapped in hexdump output)
First four characters of DBOOT.img7 (or indeed, of any Dolphin Smalltalk image file) should be "IST" (0x49 0x53 0x54 0x00). If you get stuck, go through the steps in https://github.com/brickviking/Dolphin/wiki/. I may have missed a step in the instructions I gave above, I've only just recently got this down in text form myself. Could you post (here) the DBOOT.img7 you have here?