C# Definition:

    [ComImportAttribute()]
    [GuidAttribute("bcc18b79-ba16-442f-80c4-8a59c30c463b")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IShellItemImageFactory
    {
        void GetImage(
        [In, MarshalAs(UnmanagedType.Struct)] SIZE size,
        [In] SIIGBF flags,
        [Out] out IntPtr phbm);
    }

VB Definition:

    <ComImportAttribute(),  _
    GuidAttribute("bcc18b79-ba16-442f-80c4-8a59c30c463b"),  _
    InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)>  _
    Public Interface IShellItemImageFactory    

        Sub GetImage(ByVal size As SIZE, ByVal flags As SIIGBF, ByRef phbm As IntPtr)
    End Interface

User-Defined Types:

SIZE

SIIGBF

Notes:

To get a thumbnail for a shell item, simply cast the IShellItem instance to IShellItemImageFactory and call GetImage() on it. Usage may look something like this:

    IShellItem ppsi = null;
    IntPtr hbitmap = IntPtr.Zero;
    // GUID of IShellItem.
    Guid uuid = new Guid("43826d1e-e718-42ee-bc55-a1e261c37bfe");
    SHCreateItemFromParsingName(filename, IntPtr.Zero, uuid, out ppsi);
    ((IShellItemImageFactory)ppsi).GetImage(new SIZE(256, 256), 0x0, out hbitmap);

    //Alternatively one does not need IShellItem - this works on Win10
    IShellItemImageFactory ppsiif = null;
    IntPtr hbitmap = IntPtr.Zero;
    SHCreateItemFromParsingName(filename, IntPtr.Zero, new Guid("bcc18b79-ba16-442f-80c4-8a59c30c463b"), out ppsiif);
    ppsiif.GetImage(new SIZE(256, 256), SIIGBF.SIIGBF_BIGGERSIZEOK | SIIGBF.SIIGBF_THUMBNAILONLY, out hbitmap);
    var image = Image.FromHbitmap(hbitmap);
    DeleteObject(hbitmap);

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