Convert cm to dds Online: cm2dds

You can use Tom's Editor to easily convert images from
Puzzle image from X11 .CM to Direct Show Surface .DDS.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

CM

Puzzle image from X11 is an image format with extension CM.

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.