Using C#/WIA version 2.0 on Vista to Scan

const string wiaFormatJPEG = "{B96B3CAE-0728-11D3-9D7B-0000F81EF32E}";
CommonDialogClass wiaDiag = new CommonDialogClass();
WIA.ImageFile wiaImage = null;

wiaImage = wiaDiag.ShowAcquireImage(
        WiaDeviceType.UnspecifiedDeviceType,
        WiaImageIntent.GrayscaleIntent,
        WiaImageBias.MaximizeQuality,
        wiaFormatJPEG, true, true, false);

WIA.Vector vector = wiaImage.FileData;

Image i = Image.FromStream(new MemoryStream((byte[])vector.get_BinaryData()));
i.Save(filename)