This is the . You downloaded a very old Teeworlds skin. Modern clients generally handle this, but if they don't, open the PNG in an image editor and save it again (this re-writes the header bytes correctly). Or, look for a "fixed" version of the pack.
Several fan-made databases archive thousands of Tee skins and map resources. Websites dedicated to Teeworlds (the base game for DDNet) often host compatible texture files that work perfectly in DDraceNetwork. 🛠️ How to Install DDNet Texture Packs Ddnet Texture Packs UPD
: Packs that replace standard guns with themed or high-definition models. This is the
Ddnet texture packs are community-created graphical mods used with Teeworlds servers running the DDraceNetwork (ddnet) mod. They change how maps, items, player skins, HUD elements, and decorative details appear, improving clarity, competitive fairness, or simply adding artistic flair. "UPD" in this context commonly stands for “update” — either a new release of a texture pack or an update process for keeping packs compatible with server and client changes. This column explains what ddnet texture packs are, why they matter, how updates work, and practical guidance for players, pack creators, and server operators. Or, look for a "fixed" version of the pack