In short, my initial mistake was packaging the executables into the ISO directly. Booting into MS-DOS 6.22 worked, but just as it had done when I used the unaltered boot ISO, displayed only the 40 files that came packaged with DOS 6.22 by default, completely ignoring the extra files I added to the new ISO.Īfter a lot of work, research and guidance from I finally managed to accomplish the goal of packaging the legacy executables I needed into an ISO and successfully run them from within MS-DOS 6.22. Inserting the flash drive booted into grub4DOS as it should have. The operation ran successfully, and I used WinSetupFromUSB to load the newly-created ISO onto a bootable flash drive. I then added ISO9660 and UDF volume labels, and selected the Build button.

I downloaded the boot floppy/diskette image for DOS 6.22 ( Dos6.22.img) from here, and selected it as the Boot Image in Advanced > Boot Manager, with the below settings: I then opened ImgBurn's Build mode, and then selected the 40 DOS files and my executables as the source, totalling 57 files. To do this, I extracted all 40 files from the original boot disk ISO using WinRAR. As described in this question, I used WinSetupFromUSB to successfully create a multibootable USB that could boot into MS-DOS 6.22 - as well as installers for other version of Windows - but couldn't access any of the executables I needed on the root of the USB.Īs a solution to this, I'm now attempting to package the executables I need with the original DOS 6.22 boot disk ISO found here to create a new ISO containing everything I need.

Rufus ms dos 6.22 iso