Without upgrading 8.04 to 8.10, the issue can also be resolved by upgrading only the genisoimage package. This only involved installing the binary package shipped in 8.10. After doing that I was able to produce an iso that is WinXP-readable.
Without upgrading 8.04 to 8.10, the issue can also be resolved by upgrading only the genisoimage package. This only involved installing the binary package shipped in 8.10. After doing that I was able to produce an iso that is WinXP-readable.