What version of MS-DOS does Rufus use to make bootable USBs

bootable-mediams-dosrufus

Rufus allows for the creation of a bootable MS-DOS flash drive. It does this out of the box as an option without needing to specify an image or ISO.

Rufus main interface

However, documentation on the tool is virtually non-existent as it is, and I can't find anything that specifies what version of DOS the program uses for this purpose. Does anyone know?

Best Answer

He extracts the version from the Windows file diskcopy.dll 

/* Extract the MS-DOS files contained in the FAT12 1.4MB floppy
   image included as resource "BINFILE" in diskcopy.dll */
static BOOL ExtractMSDOS(const char* path)

looking at other comments in dos.c that are the DOS files from WinME (DOS 8.0), he does the same patching as shown here:

* COMMAND.COM and IO.SYS from diskcopy.dll are from the WinME crippled version  
* that removed real mode DOS => they must be patched:  
* IO.SYS            000003AA          75 -> EB 
* COMMAND.COM       00006510          75 -> EB
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