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A dummy file will usually be very large in size, at least 100MB but can be any size. They are used to help the game load faster since when you burn the game all the files will have a different location on the disc than the original game.
Dummy files can have any extension. But most Dreamcast ISO's out there have them with a .DAT extension. They are NOT required in order for the game to work, so you can delete it if you want but I suggest you include it.
If you want to find dummy files fast on your game, just arrange the icons by size, most likely the last one will be the dummy file. If it is a dummy file, you can open it with a text viewer such as Notepad. It will have some numbers depending on the size on the dummy file.
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