UniConvertor is a universal vector graphics translator. The project uses sK1 engine to convert one format to another. It has an import filters for: CDR, CDRX, CDT, CMX, AI, CGM, WMF, XFIG, SVG, SK, SK1, AFF and export filters: AI, SVG, SK, SK1, CGM, WMF.
On my Debian system, the only conversion that I am missing is svg2wmf. UniConverter has been suggested by Inkscape. This is the only reason for me to try it out. Under these constraints and in my situation, UniConverter is unfortunately completely useless, as the WMF-conversion of a (standard) SVG does not work, neither on the command line, nor from Inkscape. As the other conversions appear to be unaffected by this problem, I suggest to remove any promises that concern the wmf output-format on Linux-system. It will avoid disappointment with your users.