What is a dds file and how do I open a dds file?
DDS files are in the raster image format used by Microsoft DirectX to store textures and environments. These files can store compressed and uncompressed pixel formats. They are sometimes used for storing Windows desktop backgrounds or wallpapers, as well as for texturing video game unit models. The format was introduced with DirectX 7.0. In DirectX 8.0, the support for volume textures was added. Originally designed for DirectX, it can also be utilized in OpenGL as well via the GLSL (OpenGL Shading Language) ARB texture compression extension. It is not part of the OpenGL standard and is not in all implementations due to S3TC being a patented and royalty based system. With Direct3D 10, the file format was extended to allow an array of textures to also be included, as well as support for new Direct3D 10.x and 11 texture formats.
HOW TO OPEN A .DDS FILE?
To launch a .DDS file, or any other file on your PC, simply double-click it. If your file associations are set up correctly, the software that's meant to launch your .DDS file will open it. You may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, however.DDS files aren't yet associated with it. In this case, when you try to open a .DDS file, you can tell Windows which application is the correct one for that file. From then on, opening a .DDS file will open the correct application.
Relevant dds file links:How to open dds file on Youtube
How to open dds file on Wikipedia
How to open dds file on Microsoft.com