I forgot where, but there was a recent question about wmf support by fpvectorial. So far, there was none, but now at least we have reading support: I uploaded a cross-platform Windows MetaFile reader for fpvectorial. It does not implement all the records documented (
http://msdn.microsoft.com/en-us/library/cc250370.aspx), but the demo program in the examples folder (wmfViewer) can read all the files that I came across.