Sony Ericsson Phone Backup File
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What is an ECS file?
Backup data file created by Sony Ericsson mobile phones; saved in a compressed .ZIP format that can be read by phones using the Symbian operating system.
Data from a ECS file can be read on a computer by renaming the file extension from ".ecs" to ".zip" and opening the file with an unzipping program like WinZip. The file "filestore.dat.txt" contains an index of what is stored in the associated DAT files.