Cannot open .webp directly from explorer

[Hanswurst]

Hi,

consider this setting:

Windows 10x64 v1909 (non-admin rights account)
XnView Classic 2.49.1 (Standard installer)
Libformat Version 7.33

libwebp.dll present in C:\Program Files (x86)\XnView\PlugIns\
libwebp.dll not present in Info --> Plugin Information

If I open a .webp image from windows explorer, all I get is an empty XnView window.
But I can click the jpg image next to it and then seamlessly change to the .webp picture by pressing PgUp/PgDwn.

Deleting [...]\Roaming\XnView and reinstalling didn't help. Reboot didn't help.

XnView is set as standard image viewer in Win10 settings.

Anyone got some suggestion what I could do? Is there a debug mode or something?

Thank you,
Hanswurst

[xnview]

and if you drag&drop a webp on XnView's icon?

[Hanswurst]

Drag'n'drop on the xnview.exe works fine.
XnView MP also works fine. I'll probably stick to it.

However if you are interested in debugging this, I'm here to help.

[xnview]

so i think that there is a problem in the registry entry for webp

[Hanswurst]

Probably.
But I'm trying not to ruin my fresh Win10 install by using RegEdit or ShellExt tools right now