======ISO file extracting and new ISO generation======
ISO files are basically DVD images; the GameCube, in fact, uses Mini-DVDs, with work the same as normal DVDs (exept they are smaller).

For this tutorial, some files may be needed, [[https://mega.nz/#!lk8HzZBC!wIKTzFtMnXPQbFx9pd77ViylSbzJ6VO3i8E_9xD6U5Q|GCTool and GCRebuild]].

====File extracting====

To extract files from GCN ISOs, you must open GCTool as admin, and open up your Paper Mario TTYD ROM, after doing so, it should look like this:
{{ paper_mario_the_thousand_year_door:capture.png?nolink&1000 |}}

Now create a new folder somewhere, and on GCTool, go to ISO>Extract whole ISO. Now select extract also Header and AppLoader, press Choose DIR, select your newly created folder and Extract. This might take 5 minutes. You are now ready to follow any tutorial where a not ISO ROM is needed.

If the instructions wern't clear enough, here is a GIF to show you what to do:

{{ paper_mario_the_thousand_year_door:ezgif.com-video-to-gif.gif?nolink |}}

====New ISO generation====

This part is easy, just open GCRebuilder, open the root folder where your modified rom is, go to save and then rebuild.

Here's the GIF on how to do it:

{{ paper_mario_the_thousand_year_door:ezgif.com-video-to-gif_1_.gif?nolink |}}