Thanks Gilles!!!! I had already downloaded that file(initrd_ntfs). So I put it on my HD at /bootISO, and booted a Knoppix remaster iso (kalango) at /dev/hda7 (root=/dev/hda7). Since it was an iso file I think this will work to any iso, provided the distro has the same kernel. I've been using the knoppix file (inside the iso) as an alternative to boot the system without using a CD drive. Now, thanks to this new option, I can boot the iso file directly, no need to extract the knoppix folder from within the iso to a HD partition as I used to. By the way, I downloaded the wrong version of knoppix games. Instead of the DVD iso (v. 4.02) I have downloded the CD iso (v.3.07). Anyway, since I was able to boot a remaaster of Knoppix with that initrd-ntfs and plus the tips you gave me, I believe I'1ll be able to boot also the Knoppix CD iso. I have a FAT32 partition only for this purpose.
As soon as I try it I'll let you know if I succeeded or not.
Tahnk you asgain