Irfanview reports .pns files as having the 'wrong extension' when in fact a PNS is a PNG file for stereoscopic images, so a valid extension.
See here for confirmation: https://en.wikipedia.org/wiki/List_of_file_formats
Irfanview has no issue displaying them BTW since they are standard PNG with the only difference that they have a 'stereoscopic' flag set, although sometimes they even forget to set that flag and then it becomes a PNG that is just vanilla PNG.
Windows also doesn't display an icon for them, so even Microsoft is unaware of their existence, so you can't blame irfan for missing this one.
See here for confirmation: https://en.wikipedia.org/wiki/List_of_file_formats
Irfanview has no issue displaying them BTW since they are standard PNG with the only difference that they have a 'stereoscopic' flag set, although sometimes they even forget to set that flag and then it becomes a PNG that is just vanilla PNG.
Windows also doesn't display an icon for them, so even Microsoft is unaware of their existence, so you can't blame irfan for missing this one.
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