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Summary

The ExtractAssociatedIcon API

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static extern IntPtr ExtractAssociatedIcon(IntPtr hInst, StringBuilder lpIconPath,

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Shared Function ExtractAssociatedIcon _

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Both the ExtractAssociatedIcon and 'System.Drawing.Icon.ExtractAssociatedIcon' extract only a 32x32 pixels icon.

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The ExtractAssociatedIcon function also does not execute as documented. The documentation states that

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Consider a Winform application with a OpenFileDialog that helps pick some file. This is then passed to the ExtractAssociatedIcon method to get the icon and display in a picture box.

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    static extern IntPtr ExtractAssociatedIcon(IntPtr hInst, StringBuilder lpIconPath,

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        IntPtr handle = ExtractAssociatedIcon(this.Handle, strB, out uicon);

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Use static method 'System.Drawing.Icon.ExtractAssociatedIcon(string filePath)' in assembly 'System.Drawing.dll' (.net 2)

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Documentation

[ExtractAssociatedIcon] on MSDN

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Icon.ExtractAssociatedIcon(sFile)

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Icon.ExtractAssociatedIcon(sFile)

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If you only want to get the icon you can use managed System.Drawing.Icon.ExtractAssociatedIcon(String file)