I am also using Yac Reader. You can use Qt plugin to do add support for AVIF.
First download this: https://github.com/novomesk/qt-avif-image-plugin/releases/download/v0.5.0/qavif.dll
Then move the downloaded qavif.dll to <Yac Reader Installation Folder>/imageformats/
Finally, restart Yac Reader and you can now start adding archives with AVIF files.
P.S. The <Yac Reader Installation Folder> for Windows is usually C:\Program Files\YACReader
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