.ply
PLY modelPolygon File Format
The Polygon File Format, also called the Stanford Triangle Format, devised at Stanford in the 1990s. It stores vertices and faces with extra properties such as per-vertex colour.
3D scans, point clouds and research data.
Opens in MeshLab, CloudCompare, Blender
About PLY 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