The shape of the DLL icon looks like a standard piece of white computer paper. The top right corner is folded down, similar to what one might do when bookmarking a novel they are reading. In the center of the rectangle are the uppercase letters DLL.
Related to DLL Icon
Related icons are the icons with matching tags, as well as all files icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors