Windows 11 Create ICO file with transparent background which looks error-free in the "small" explorer detail view

[larry54321]

I have an ICO file with a transparent background which looks unclean in the small detail view of Windows Explorer.My icon is a drawn shape in PhotoShop and exported as PNG in different sizes to create it in Gimp as an ICO. It looks normal and sharp everywhere except in the detail view. I noticed that all other program icons like chrome also look like this as soon as they have a transparent background. An exception is, for example, PDF24, which looks clean.I don't see any difference when I import it into PhotoShop, except that the PDF24 ICO has an alpha channel. But if I add an alpha chann

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