Those non-dos images must be relatively new as I don't recall them either.
I thought maybe I would make some instructions for the linux challenged people who may be trying this.
I downloaded the WindowsME image because it has the latest version of fdisk which may help if you want to work with a larger drive.
1. Download winmec.zip from
http://bootdisk.com/bootdisk.htm
It's located down the page abit in the section called Non-Windows Based Image Files W/Image app
2. Go to the folder where the image has been downloaded to and unzip it with the command:
unzip winmec.zip
3. Format a floppy disk with the command:
mkfs.vfat /dev/fd0
4. Put the image onto the floppy disk with the command:
dd if=WINME.IMG of=/dev/fd0 which gives a message like this ...
2880+0 records in
2880+0 records out
5. After the image is successfully copied over to the floppy, you may need to remove some less important files if you want to add something like bios tools.