Insert Guest Additions into bootable.iso

[bigmahlman]

Got a weird one.
For my job I need to boot into a knoppix boot disk everyday. I have copied the .iso file to the hard drive, I can boot into it using virtual box with one minor problem. It does not fill my wide screen monitor. It is stuck at a 4:3 resolution. I figure this is because Guest Additions. Problem is that the boot disk is locked down no way to access the guest additions .iso or use the kernel . So is it posible to edit the .iso file that i dumped to the hard drive? If anyone knows how to do that and could show me the way it would be amazing.

[fixedwheel]

knoppix boot disk (...) So is it posible to edit the .iso file that i dumped to the hard drive?

ask knoppix http://www.knoppix.net/wiki/Knoppix_Remastering_Howto