I've used DDOs with Win95, so I'm reasonably familiar with how they work. I'm still using Win98SE, BTW.
There will be a small dummy entry in the partition table in sector 0, plus some custom MBR code. This code retrieves the INT13 extensions from additional sectors in track 0, and loads them into RAM as a small TSR (~3KB). This TSR points to a second MBR and partition table with the drive's full capacity, also located on track 0.
I believe all you need to do is to copy the contents of the second MBR over the DDO code in sector 0.
If you are familiar with disc editors, then save the contents of track 0 to a file and upload it.
Alternatively, you can use MBRtool to do the same thing:
http://www.diydatarecovery.nl/mbrtool.htmStill another way is to use Microsoft's Sector Inspector to retrieve the partition table:
http://www.users.on.net/~fzabkar/SecInspect.zipExtract the above archive to the one folder and execute the SIrun.bat file. The procedure will generate a report file named SIout.txt.