[steve1977]

Would that have been ILBM specifically? https://en.wikipedia.org/wiki/ILBM

I wasn't using Amigas at that time, I had an Atari... I vaguely remember Targa files (.tga)

[surfingdino]

DeluxePaint used IFF. Here's a good writeup https://sandervanderburg.blogspot.com/2012/06/iff-file-forma...