.obj
OBJ modelWavefront OBJ
A plain-text geometry format from Wavefront Technologies, dating from the 1980s. It lists vertices, texture coordinates, normals and faces; materials live in a companion .mtl file.
Moving static meshes between almost any 3D programs.
Opens in Blender, Maya, Cinema 4D, Windows 3D Viewer, Quick Look on Mac
About OBJ files.png
PNG imagePortable Network Graphics
A lossless image format created in the mid-1990s as a patent-free replacement for GIF. It keeps every pixel exactly and supports full alpha transparency.
Screenshots, logos, icons and graphics with sharp edges or see-through areas.
Opens in every browser, Photos, Preview, Paint and nearly all image editors
About PNG files