To Edit DDS nVidia has the following information, which seems to work for me.
===[ From nVidia ]===
This is a DXTC texture compression plugin for Adobe Photoshop that allows you to open and save .dds files in RGB format. The plugin reads and writes .dds files compressed or uncompressed.
NVIDIA Texture Tools
http://download.nvidia.com/developer...eSuite/dds.8bi - You will need to place the plug-in C:\Program Files\Adobe\Photoshop CS\plugins\file formats.
These required dlls (msvcr71.dll and msvcp71.dll) in your Windows\System folder. Google them.
Once all the plugins are installed, you can open the ipb.dat and the logo.dat from the client/data folder and rename it to logo.dds and you can edit it to suit your needs and make it exclusive to your server.
You gotta download the TDB to DDS converter for image files. It's kinda rare to get but you can try the P2P's. Pretty common there.