IFF files originated with the Amiga. The IFF
file standard is extremely flexible and it supports all sorts of things besides
storing images. IFF files are found in PC environments PC having been ported
from Amiga systems. They are also created on the PC by several applications such
as Electronic Arts' Deluxe Paint – in this case they may have the extension
LBM.
Note that there are a
number of proprietary variations on the IFF format which GFX-View cannot read.