On various sites there are instructions on how to make an ms-dos bootable usb.
See here:
http://blogs.technet.com/b/csstwplatform/archive/2012/06/26/how-to-create-a-ms-dos-bootable-usb-flash-drive.aspx
http://blogs.technet.com/b/csstwplatform/archive/2012/06/26/how-to-create-a-ms-dos-bootable-usb-flash-drive.aspx
and here:
http://www.sysprobs.com/how-to-create-bootable-dos-usb-disk-in-windows-8-8-1
http://www.sysprobs.com/how-to-create-bootable-dos-usb-disk-in-windows-8-8-1
This appears to be a pirated copy of MS-DOS 7.1, probably taken from Windows98SE. The original web site, yginfo.net, disappeared some time ago.
Both use iso's from this site:
http://www.allbootdisks.com/download/iso.html
http://www.allbootdisks.com/download/iso.html
![Iso Iso](/uploads/1/2/4/8/124845725/260984554.png)
![Dos Dos](https://www.trishtech.com/wp/wp-content/uploads/2017/07/iso-workshop-1.jpg)
I have not tested them all. Rufus do not work with these two iso's:
http://www.allbootdisks.com/downloads/ISO/AllBootDisks_ISO_Image_Downloads25/Win98SE_bootdisk.iso
http://www.allbootdisks.com/downloads/ISO/AllBootDisks_ISO_Image_Downloads25/Win98_bootdisk.iso
http://www.allbootdisks.com/downloads/ISO/AllBootDisks_ISO_Image_Downloads25/Win98SE_bootdisk.iso
http://www.allbootdisks.com/downloads/ISO/AllBootDisks_ISO_Image_Downloads25/Win98_bootdisk.iso
Both rufus_v1.2.0 and rufus_v1.1.7 reports Unsupported ISO
'This version of Rufus supports bootable ISOs
based on 'bootmgr/WinPE' ir 'isolinux'.
This ISO image doesn't appear to use either...'
'This version of Rufus supports bootable ISOs
based on 'bootmgr/WinPE' ir 'isolinux'.
This ISO image doesn't appear to use either...'
The instructions in one of the sites clearly say 'Download rufus utility, Rufus v 1.1.7 without FreeDOS Support (154KB) from here'.
Do not know if the site is broken or Rufus.
Either way 7-zip reports 'Incorrect big-endian headers' on both ISOs.
It did work before based on the instructions.