With Filestar you get 2 different skills for working productively with PNG Stereo Image (.pns) files.
About .Pns
Name
PNG Stereo Image
Extension
.pns
Format
Binary
Category
Raster Image
Developer
I3DL2 (Interactive 3D Audio Layer 2)
Description
PNS is a file type used for storing stereoscopic or 3D images in the Portable Network Graphics (PNG) format. It is a combination of two side-by-side PNG images, giving the visual effect of depth or 3D when viewed in 3D glasses.