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