Just checked with HxD and my Gekikara disk already has the 512 bytes from the MSX-DOS2 disk so all seems good to me. I can get the game to work, but I need to manually start basic and type run"autoexec.bas".
@mars2000you: If you have an autoboot .dsk file could you please share it? I'd like to compare it with mine to see what differs. I tried with both OpenMSX and BlueMSX and it doesn't autoboot in both.
Are you using the "original" game DSK or another you have made? I just tried it and worked fine (the game automatically boots)
If you have made a DSK, be sure to erase MSX-DOS2 files (COMMAND2.COM and MSXDOS2.SYS)
@ssj: send me a mail (my e-mail address is on my profile, but I can't find your e-mail address)
Guillian nailed it! I had to delete those 2 files that's why it wasn't auto booting, I knew I must be missing something since it was the first time I had to do something like this for a Basic game.
Thanks for the help guys, all working great now.