Pb to mount DOS media

I used both QNX on my PC and an Atari Falcon.
For files transfer I use a SCSI Zip drive.
The Falcon makes a modify DOS partition which can be read on Windows
and on Atari.
However QNX doesn’t know my Zip disk as a DOS partition.
I think it is a problem concerning the differences between FAT12, FAT16
and VFAT
Any one have an idea?