I've gotten this WMF file which (probably) contains an image, somehow. I saved it out of a .docx file opened in Libreoffice, so it can't be entirely corrupt (I think). If I run file on it, I get:
$ file /tmp/sg30.xyz.wmf
/tmp/sg30.xyz.wmf: Windows Enhanced Metafile (EMF) image data version 0x10000
but both Inkscape and wmf2svg seem to think it's corrupt. What do I do?