Aspose.Words.Viewer.DocumentRenderer renderer = new Aspose.Words.Viewer.DocumentRenderer();
Aspose.Words.Document aDoc = new Aspose.Words.Document();
switch (fileExt.ToUpper())
{
case "DOC":
aDoc = new Aspose.Words.Document(docStream, "", Aspose.Words.LoadFormat.Auto, "");
break;
case "DOCX":
aDoc = new Aspose.Words.Document(docStream, "", Aspose.Words.LoadFormat.Docx, "");
break;
}
renderer.Document = aDoc;
Image FV_thumbnail = (Image)renderer.GetPage(1);
This throws Invalid Parameter error for some documents. Please advice