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This is the specifications for the archive file which is handled by the Game Extractor plugin Archive_ERF_ERFV30.

Endian Order:	Little Endian
Compression:	Unknown
Encryption:	None

This format is used by the following Games:

Dragon Age 2

*.erf

This is the format specification information:

// ARCHIVE HEADER
  16 - Header ("ERF V3.0") (unicode)
  4 - null
  4 - Number of Files
  2 - null
  2 - Unknown (8192)
  20 - null
  
// DIRECTORY
  // for each file (28 bytes per entry)
    4 - Unknown (-1)
    8 - Unknown (Timestamp/Hash?)
    4 - Unknown
    4 - File Offset
    4 - Compressed File Length
    4 - Decompressed File Length
    
// FILE DATA
  // for each file
    X - File Data (Unknown Compression)

Game Extractor is able to read files of this type, as well as files from thousands of other games. To give it a try, download Game Extractor (Basic Version) for free, and see what it can do.

For further information on this format, refer to the source code on our GitHub repository.