This is the specifications for the image file which is handled by the Game Extractor plugin Viewer_TCGIL_GIL3.

Endian Order:	Little Endian
Compression:	none
Encryption:	None

This format is used by the following Games:

Utopia City

*.tcgil

This is the format specification information:

// IMAGE HEADER 4 - Header (GIL3) 4 - Unknown (21) 4 - Version (3) 4 - Format Type (DXT1, DXT5) 4 - Unknown (1) 4 - Image Width 4 - Image Height 4 - Number Of Mipmaps 4 - null 4 - Unknown 4 - Hash? // DIRECTORY // for each mipmap 4 - Mipmap Length // IMAGE DATA // for each mipmap X - DDS-Format Image Data (DXT1/5 depends on the header Format Type)

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.