This is the specifications for the image file which is handled by the Game Extractor plugin Viewer_UE3_Texture2D_539.

Endian Order:	Little Endian
Compression:	None
Encryption:	None

This format is used by the following Games:

Alpha Protocol

*.texture2d

These are the accompanying notes and further information:

Unreal Engine 3 (Version 539) Texture2D Image

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.