Convert dc1 to dds Online: dc12dds

You can use Tom's Editor to easily convert images from
DuneGraph (compressed) .DC1 to Direct Show Surface .DDS.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

DC1

DuneGraph (compressed) is an image format with extension DC1.

DDS

DDS are files invented by Microsoft to be used in games, mostly as textures. Images can be compressed to save space but the compression methods defined by DDS are all very fast in terms of coding and decoding.