DOS-based Windows OS’s include Windows 95, Windows 98 and Windows Millenium.
Rename the ISO file to have a .isoDOS01 file extension – once booted from Easy2Boot, the CD files will be on the B: drive.
It is best to remove some unneeded files from the Win98 ISO before using it to reduce the size of the ISO.
You can also make a .imgPTN file using the MPI Tool Kit to make a bootable DOS partition.
Win95/98/Me are very old. They will therefore only run on very old systems with small IDE hard drives (or BIOS configured for Legacy IDE) and less than 1GB of RAM. DOS can get very confused about large hard disks and systems with large RAM memory! Even if you manage to get it installed, you will probably not be able to run a browser or get audio working. Graphics will also be limited. No USB access, WiFi, Bluetooth, Ethernet, etc.