peternorth

Hello and thanks for any help. I have a .img bootable file. I want to add a file to it. I tired: 1 unpacking original .img 2. adding the extra file to the unpacked img 3. dragging the whole lot into imageburn (create image from files or folder) 4. checking advanced make bootable. and then needed a boot image? (where can I get that from) 5. tried a file I found online for the boot image 6. it failed. wouldn't boot Can anyone please help? Many thanks