Krita can open AVIF, but it's not registered on its desktop file.
Git commit 6d6e216c9b1ee4ccff81ffd4127f965ae72c5d7a by Halla Rempt. Committed on 08/12/2022 at 13:51. Pushed by rempt into branch 'master'. Add image/avif to the heif desktop file M +1 -1 plugins/impex/heif/krita_heif.desktop https://invent.kde.org/graphics/krita/commit/6d6e216c9b1ee4ccff81ffd4127f965ae72c5d7a
Git commit 75a7d4da3e1e8dbe60e2d0815a415affe8280ccd by Halla Rempt. Committed on 08/12/2022 at 13:51. Pushed by rempt into branch 'krita/5.1'. Add image/avif to the heif desktop file (cherry picked from commit 6d6e216c9b1ee4ccff81ffd4127f965ae72c5d7a) M +1 -1 plugins/impex/heif/krita_heif.desktop https://invent.kde.org/graphics/krita/commit/75a7d4da3e1e8dbe60e2d0815a415affe8280ccd