This means that we don't have a legal way to create MS-DOS bootable USB flash drives any more, and the end result is that: However, with the introduction of Windows 10, Microsoft dropped the ability to create bootable floppies (since nobody using Windows 10 is expected to boot from floppy) and removed diskcopy.dll. So, up to Windows 10, we relied on the fact that the MS-DOS files (from Windows ME) were included in the DLL ( diskcopy.dll) that Windows uses to create DOS bootable floppy disks (which actually contains a complete bootable floppy FAT image), and picked the files from there, which we can legally do. As correctly pointed by the version of MS-DOS provided by Rufus is the MS-DOS from Windows Millenium Edition, "uncrippled" to enable boot (I didn't invent this patch, but picked it up from the HP USB and other tools).Īlso, and this is the important part, Rufus does NOT embed the MS-DOS files within the application, but picks them up from the Windows system it is running from, because, since the MS-DOS binaries are proprietary and copyrighted by Microsoft, it is illegal for anybody else but Microsoft to distribute MS-DOS binaries, be it in a zip file or an application (as a matter of fact, it appears that HP got into legal problems with Microsoft when they tried to produce a version of their HPUSBFW utility that embedded the Windows 98 MS-DOS files, and Microsoft quickly got them to stop doing that).
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