Convert ap3 to dds Online: ap32dds

You can use Tom's Editor to easily convert images from
Atari AP3 .AP3 to Direct Show Surface .DDS.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

AP3

Atari AP3 is an image format with extension AP3.

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.