DDS files wont convert

[JetTheFox96]

Here are the files I am wishing to convert


They are the Chaos Emerald textures from Sonic Riders, but the only problem is, I cant open them. I tried Paint.Net, DDSConverter and Nvadia DDS fix, but it does not d seem to work. What type of DirectDraw Surface file is this and how can I fix the problem so I can convert it to Png with ease?

[Nooga]

Those are either encrypted or compressed. Perhaps the folks at Xentax might be able to help. Alternatively, you could use something like RenderDoc to dump the textures while playing. If you're grabbing these from the Gamecube version you don't even need RenderDoc, just use Dolphin's own texture dumping option. Downside is you need to see the textures for the chaos emeralds in game and would have to sort through all the dumped stuff, but it's better than trying to fiddle with compression shenanigans imo.