Normally, I'd say "Hie thee to Google" and cast doubt upon your manhood and parentage for asking such a simple question...

...but I've been Googling for half an hour now and I can't find out WHAT one of these things is. I can find out which ones you need to do RIPL to Warp 4 clients from Warp 4 Server, but the what and how escapes me.

Best guess is that it's some kind of IBM-special fixpak format, that you need a spiffy tool to apply.