Convert rp to dds Online: rp2dds

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

Go to Tom's Editor

RP

Rainbow Painter is an image format with extension RP.

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.