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

Endian Order:	Little Endian
Compression:	None
Encryption:	None

This format is used by the following Games:

Knight Online	*.gtt *.dxt
Legend of Ares	*.gtt *.dxt

This is the format specification information:

// DIRECTORY AND IMAGE DATA // for each file 4 - Filename Length (can be null) X - Filename (only if FilenameLength > 0) 4 - Header ("NTF" + (byte)3) 4 - Image Width/Height 4 - Image Width/Height 4 - Image Format (DXT1) 4 - Unknown (1) // for each mipmap (for all sizes down to 4x4 inclusive) X - Image Data

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.