Trying to modify boot image

[gtg]

I'm trying to follow the docs to create my own version of Knoppix. The docs talk about mounting the boot image using "mount -o loop -t vfat boot.img boot" But when I try this under Knoppix 3.6, it fails complaining about wrong file system, etc. (I've tried both the 2.4 & 2.6 images)

Can someone point me in the right direction ?

Thanks,

GTG