Convert qrt to dds Online: qrt2dds

You can use Tom's Editor to easily convert images from
DKB Trace / Qrt raytrace .QRT to Direct Show Surface .DDS.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

QRT

DKB Trace / Qrt raytrace is an image format with extension QRT.

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.