Irfanview and XnView MP (Classic probably too) is the only tools which could show original colors in non-standart PSD files, but option to enable\disable layers isn't present while it avaliable in many other programs, even online ones (Corel Painter, Manga Studio\CLIP Studio, Photopea, GIMP). But last ones dont have enable\disable layers or fails with colors.
Could be possible to add option for .psd at least to view layers as list or folder tree withh option to disable (minus icon) and enable (plus icon) separate layers by single or group during merge view?
PSD layers view disabling in merge view
Moderators: XnTriq, helmut, xnview