Retro64 ECO

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  • Format Type : Encrypted Text (XML)
  • Endian Order : Little Endian
  • Signature : None

Format Specifications

// ECO file format

x bytes - XML file data (encrypted with custom XOR algorithm)

Notes and Comments

  • This file format occurs in some games made by Retro64, Inc.
  • ECO files are encrypted XML files. Retro64 had created a program called "Encrypto!" to convert XML files using custom keys.
  • ECO files are encrypted with custom XOR algorithm.


List of games using this file format:

  • Best Friends / Best Friends Forever (PC) (*.ECO) (encrypted with key "49152")
  • Cosmic Bugs / Cosmo Bots (PC) (*.ECO) (encrypted with key "49152")
  • SpongeBob SquarePants 3D Obstacle Odyssey (PC) (*.ECO) (encrypted with key "49152")
  • Water Bugs (PC) (*.ECO) (encrypted with key "49152")

QuickBMS Script

Compatible Programs

Encrypto! program


Encrypto!  Copyright 2001, Retro64, Inc.
Usage: Encrypto <input_file> <key>

Example conversion:

encrypto.exe water_level1.xml 49152
encrypto.exe water_bugs.xml 49152

where 49152 is an encryption key.

See Also