As part of the MSDN subscription I just got, I can download MS-DOS 6.22 (wow indeed).
I want to install it to a VirtualBox VM so I can try old games and viruses (due to viruses, I can't install it to DOSBox- some viruses would infect my actual files too), how can I do this?
The file you can download is an .exe SFX file which outputs these files.
C:\msdos\DISKS\144UPG1.IMG
? I don't have this exact installation package, but the one I have is also made up of three 1.44MB image files, and I just tried and succeeded in installing MS DOS 6.22 by booting from the first one, and then changing it to the 2nd/3rd as the installation procedure went on.Devices/Floppy drive/Choose image
? That worked for me. If you turn on the VM for the first time, I think it asks for a CD image which would be a different format, so you'll have to add it as a floppy disk image.