Hi,

According to this KB article, "the .NET Framework uses a new Clipboard format when it adds metafiles to the Clipboard. Other applications, such as Microsoft Word, or the operating system are not aware of this new format and, therefore, cannot paste or display the image". Using the ClipboardMetafileHelper from it, copying to the clipboard and pasting into Word worked fine in my test:

WmfExporter wmfExporter = new WmfExporter();
wmfExporter.Export(diagram, "temp.wmf");
Metafile metafile = new Metafile("temp.wmf");
ClipboardMetafileHelper.PutEnhMetafileOnClipboard(this.Handle, metafile); 

Here you can find some sample code for converting a System.Drawing.Bitmap to a DIB:
http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/bc35d445-10a1-473c...

I hope that helps,
Stoyan