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Some preserved PSP prototype builds were distributed as DVD-R images that contain the actual UMD data inside USER_L0.IMG and, for dual-layer titles, USER_L1.IMG. These images previously required manual extraction, renaming, or concatenation before PPSSPP could load them. Add support for recognizing these DVD-R wrapper layouts and exposing the embedded UMD image through the normal disc loading path. This includes both ISO-based wrappers and UDF-based wrappers, so preserved prototype dumps can be opened directly without conversion. This makes PPSSPP compatible with a wider range of preserved developer disc images without relying on title-specific handling. The primary importance of this patch is to encourage preserving 1:1, perfect disc image dumps in the manner of Redump.org. This patch has been successfully tested on the following DVD-R ISOs: https://hiddenpalace.org/Rock_Band_Unplugged_(Dec_10,_2008_prototype) https://hiddenpalace.org/WipEout_Pulse_(May_4,_2007_prototype) https://hiddenpalace.org/Lara_Croft_Tomb_Raider:_Anniversary_(May_19,_2007_prototype) https://hiddenpalace.org/Heatseeker_(Jan_15,_2007_prototype) Fixes #15547.