Don't use a disc mounter to load the image, use something like ultraiso or migiciso, you can then drag and drop *any* file to and from the open image.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.