File Formats
Image Files
The majority of the image files within the Battlefield 2 directory structure have the PNG file extension, however most of these image files are in fact DDS files with an incorrect file extension. There are a few image files that really are PNG files (mainly within Battlefield 2\mods\bf2\Objects\), and can be easily loaded by an image viewer/editor.
The image files in Menu_client.zip are packed into a DDS Texture Atlas file. Basicly, an atlas file combines a lot of small images into one big image to improve reading performance. An index file with coordinates is used to locate the individual images in the Atlas. The Atlas images and index files are located in Menu_client.zip/Atlas.
External Links
Microsoft Developer Network DDS File Reference
Nvidia DDS Plugin for reading and writing DDS files in Adobe Photoshop