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.ESG File Extension

File Type	Enigmo Saved Game File
File Format	File
Common?	No
File Description	Saved game created with Enigmo, a 3D puzzle game in which the player directs droplets of liquid to their destination; saves the player's progress so that the game can be resumed at the current level at a later time.
Program(s) that open esg files	Mac: Pangea Software Enigmo Windows: Pangea Software Enigmo 2

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/esg