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EMF format can not be opened, because EMF was mapping to WMF module(MODULEALIAS("EMF","WMF") in module.c 114 line), but it is not registered in WMF module(in wmf.c line 2723 in function RegisterWMFImage(void)).
This issue is resolved in Mercurial change-set e060d945c7a1. Thanks for reporting this problem.
Please note that EMF files only work under Windows because the EMF module uses a Windows API. WMF files work on all platforms.