XnView Software

Hello,

the XnviewMP 0.94 works only with the HEVC Video Extensions (first link from your post).
On my PC system I also installed this one (HEIF picture extension from Microsoft):
https://www.microsoft.com/de-de/p/heif-bilderweiterungen/9pmmsr1cgpwg?activetab=pivot:overviewtab

Please deinstall ...

Which hevc HEVC extension you mean?

HEVC Video Extensions
https://www.microsoft.com/en-us/p/hevc- ... mzlz57r3t7

HEVC Video Extensions from Device Manufacturer
https://www.microsoft.com/en-us/p/hevc- ... 4wgh0z6vhq

Hello, I use the 64bit version of XnViewMP 0.94 and load or save pictures in HEIC/HEIF format.
Everything is alright!

Maybe I did not understand your problem. Why do you use the appx files to install the HEVC plugin?
You can easily install the extension from the Microsoft Store.


XnViewMP needs ...

It still uses 32bit HEIC decoder & encoder which the default install is 64bit.

I tried to uninstall the HEIF Image Extension.

And install the 32bit one from https://store.rg-adguard.net/ (use the Porductid 9pmmsr1cgpwg for search)

Microsoft.HEIFImageExtension_1.0.22742.0_x86__8wekyb3d8bbwe.Appx ...