You do not need to export to SVG then open in IE to "save image" - yEd has "save image" built-in! E.g. to save your diagram as PNG image, use "File" -> "Export", then set "Files of Type" to "PNG Format" in the export file chooser. All raster images produced by yEd (i.e. bmp, gif, jpg, png) can be imported into Word.