Hi @c00012 ,
Welcome to Microsoft Q&A!
You can reinstall the Avalonia for Visual Studio 2022 extension in Blend for Visual Studio 2022 and check it again.
Or please try right clicking the file then selecting "Open With..." > "Avalonia XAML Editor".
You can try to create another project and verify if it just occurs in Avalonia project. If so, I suppose it is related to Avalonia project, please report it in dedicated Avalonia forum.
Update:
I tested on my side and could reproduce your issue.
I installed the Avalonia for Visual Studio 2022 extension in Blend for Visual Studio, but still get the following error when opening the Avalonia MVVM application in Blend for Visual Studio:
There is no editor available for ‘C:...\xxx.axaml’. Make sure the application for the file type (.axaml) is installed.
I suppose that the Avalonia for Visual Studio 2022 extension is not supported in Blend for Visual Studio.
You can send feedback in Avalonia forum or Visual Studio Feedback.
Sincerely,
Anna
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