5.0.9 Not working for me either:
Exception:
System.FormatException: ItemId 1 has essential properties that are not supported.
at AvifFileType.ExceptionUtil.ThrowFormatException(String message) in D:\Dev_projects\AvifFileType\src\ExceptionUtil.cs:line 47
at AvifFileType.AvifParser.ValidateRequiredImageProperties(UInt32 itemId) in D:\Dev_projects\AvifFileType\src\Avif Reader\AvifParser.cs:line 345
at AvifFileType.AvifReader.CheckRequiredImageProperties(UInt32 itemId, ImageGridInfo gridInfo, String imageName) in D:\Dev_projects\AvifFileType\src\Avif Reader\AvifReader.cs:line 358
at AvifFileType.AvifReader.EnsureRequiredImagePropertiesAreSupported() in D:\Dev_projects\AvifFileType\src\Avif Reader\AvifReader.cs:line 457
at AvifFileType.AvifReader.Decode() in D:\Dev_projects\AvifFileType\src\Avif Reader\AvifReader.cs:line 145
at AvifFileType.AvifFile.Load(Stream input, IArrayPoolService arrayPool) in D:\Dev_projects\AvifFileType\src\AvifFile.cs:line 55
at PaintDotNet.FileType.Load(Stream input) in D:\src\pdn\src\Data\FileType.cs:line 491
at PaintDotNet.FileType.Load(Stream input) in D:\src\pdn\src\Data\FileType.cs:line 491
at PaintDotNet.Functional.Func.Eval[T1,TRet](Func`2 f, T1 arg1) in D:\src\pdn\src\Fundamentals\Functional\Func.cs:line 60
Diagnostics:
Application paint.net 5.0.9 (Stable 5.9.8621.1636)
Build Date Wednesday, August 09, 2023
Install type Portable
Language: en-US
DPI 96 (1.00x scale)
UI/Canvas GPU True
Rendering GPU ?? Performance (NVIDIA Quadro P400)
Remote session False
Animations True
Translucent windows True
Windows Ink True
OS Windows 10 Pro x64 (10.0.19044.0)
Runtime .NET 7.0.10 x64