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Avalonia's Window.Icon only sets the title bar via WM_SETICON. The Windows taskbar, Explorer, and shortcuts read the icon embedded in the .exe's Win32 resources, which the apphost has no way to populate without ApplicationIcon set on the project. Add a multi-resolution app.ico (16, 24, 32, 48, 64, 128, 256) generated from the existing monster PNG and reference it from the csproj.
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Summary
Avalonia's
Window.Icononly sets the title bar (viaWM_SETICON). The Windows taskbar, Explorer, and Start Menu shortcuts all read the icon embedded in the .exe's Win32 resources, which the apphost can only populate when<ApplicationIcon>is set on the project. Without it, the installed build shows a generic icon in the taskbar even though the title bar renders correctly.Generated
app.icofrom the existing monster PNG with seven sizes (16, 24, 32, 48, 64, 128, 256) so the OS picks the appropriate resolution per context. Source PNG is 613x596 — padded to a square canvas with transparent background before downscaling so nothing is cropped.