These are add-on disk images for the floppy-based install.

ethernet.img                Ethernet modules
pcmcia_wlan.img             PCMCIA modules, wireless utilities
fs1.img                     XFS/JFS modules, Ext2 extra utilities
fs2.img                     XFS/JFS extra utilities
keymaps_usb_firewire.img    Additional keymaps/consolefonts, USB, Firewire
ntfs_fdisk.img              NTFS utilities, fdisk
raid_lvm.img                RAID/LVM modules and utilities
scsi.img                    SCSI modules