some transparent pngs with a single color do not render

[Q_A]

Using Irfanview x64 4.66 with windows 10 x64 I found some bugs


irfanview does not display some transparent png files, they render in paint, windows images and xnview just fine.
here's a mega link

https://mega.nz/file/3xRzgQIL#r0yrZPMdpIeQ5-tkiO0kVwuX1NNVRDHFca2If2hmXII

here's what paint shows


and what irfanview displays

[Bhikkhu Pesala]

In Settings, Viewing change the Main Window Colour to something other than black.