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Try this https://github.com/bartlomiejduda/Tools/blob/master/NEW Tools/Mario's Early Years/Marios_Early_Years_RES_script.bms Here is file format: // Mario's Early Years // RES file format // header 130 bytes (char) - copyright string // "Memory Manager Resource File...Copyright (c) 1990-93 The Software Toolworks, Inc....All rights reserved" 7 bytes (char) - signature + null // "RICKBO" 6 bytes (char) - version string + null // "4.1.1" 18 bytes (char) - build string + null // "v02-23-93 01:45pm" 2 bytes (uint16) - number of entries 17 bytes (char) - directory name // e.g. "MUSIC" or "HELPTEXT" 2 bytes (uint16) - unknown // 2 2 bytes (uint16) - unknown // 124 // index number_of_files * { 4 bytes (uint32) - file offset 4 bytes (uint32) - file compressed size 17 bytes (char) - file name without extension // e.g. "WORLD1_XMI" 2 bytes (uint16) - file type // for types 128, 256, 1344 and 5697 files are NOT compressed } // data number_of_files * { if file_compressed: { 4 bytes (uint32) - file uncompressed size } x bytes - file data } You can even see some image data after extraction: