Didger 3 and 4 are a step toward the phasing out of the Windows Metafile format [*.WMF]. This is in response to Microsoft Windows (along with numerous applications) doing the same thing. Essentially, the WMF format is 'outdated' in comparison to the EMF format. To export a high resolution metafile, export to an Enhanced Metafile format [*.EMF].
Updated March 20, 2014