adding files to images. can it be done?

[exalos]

I downloaded CDmage the last version(beta) witch supports adding files into an image, but I found the way to complicated. it asks u how many sectors you want to add and then it allows you to import a file, which is a little bit comfusing. And another thing is that
you can save the new image(with the imported file) only as "CDRWin and fiireburner cuesheet file(*.cue)".
However I did manage to add the file I wanted to a cd together with the game.I tried extracting the files with CDmage to a temp folder. CDmage had no problem at all (the image had read errors, as the original) so I extracted the files to a temp folder, added the crack, and burned a new cd with the same label as the original.
It was so simple after all, with CDmage ofcourse!
From what I understood:
1.adding an extra file to an image isn't as easy as extracting the whole cd to a temp folder and so on...
2.Adding a file into an image can be done with these programs but then you have to convert your image to another type like ".iso" for example.
I don't know if you agree with me, but that's what i think.
Thank all for writing. You realy did help me.