Every Cryengine game uses these file types. Basically the .dds is the main header to the other .dds* files in the directory

Open .dds in Hex Editor i use HxD and copy all the info

Now open .dds1 or any other .dds* in the directory and paste this info at the beginning.

Save the .dds, you can override .dds1 but be sure to backup .dds  so you dont override the header info file!

You'll notice not all files are standard sizes. Use 64, 128, 256, 512, 1024, 2048 sizes. These will be the correct files. I tend to put (fixed) or something in the filename to keep things organized. Use Noesis to preview files or Ifranview more quickly.