Majik:
Sorry my bad english, I´m only adding more confusion to all this topic...:/
Step by step again (with additional steps):
1) download zip file (5501_1.zip)
2) unzip file 5501_1.out to your hard disk, in same directory of sdisk executable.
3) run sdisk.
4) press D(etails)
5) new filename: 5501_1.out
6) new drive: A:
7) press W(rite)
Sdisk is now writing the file 5501_1.out to the floppy disk.
The file 5501_1.out is a 720k, DD disk image.
Mgomes