dualboot windows 10 and ms-dos 7.10
Solution 1:
Dos 7.1 was part of windows 9.x. There's pirated versions floating around up till windows me's dos 8.0 but meh. IIRC the last standalone copy of dos was 6.22. You don't really want to run that tho
Freedos is a pretty awesome open source clone of dos that's actively worked on. I do believe you can throw on the livecd version to a USB key with rufus.
On modern systems, you may need to turn off secure boot. Windows 10 typically dosen't like that.
Smart money's on running it on a VM or just run dosbox on windows.