How to make .nib disk images?

[Ron Kneusel <rkneusel@qwest.net>]

Does anyone know the format used for .nib disk images and which
emulators will read these images for non-standard DOS.  Ie, AppleWin,
at least the one with source code available, seems to look specifically
for the header bytes used by normal DOS/ProDOS.

I want to be able to make a .nib image from a non-standard DOS floppy
and know which emulator is likely to run it.  Note, I do not want to
know which _programs_ make .nib image but how to write a program to make
my own.

Any help appreciated.  Apologies for anything above that is unclear.

Ron Kneusel
oneelkruns@hotmail.com