To open the Apple iPhone .heic photos, the Google .webp images or the AOMedia .avif files it's necessary to have the following WIC codecs installed:
Install Webp Image Extensions.
Older Windows (including older Windows 10)
Install CopyTrans HEIC/HEIF.
Install Google WEBP.
No codec exists.
Attention: after the codec(s) installation please restart FreeVimager and then open your pictures.