Thanks RockyRed. Very interesting that it works under Arch Linux.
Size doesn't matter with svg because it is a vector format (like wmf). You can open it in a text editor and alter the default view size. I can't remember which tag that is. Or load it into inkscape, resize and resave it.
I noticed that sometimes wmf2svg sometimes doesn't convert properly. It doesn't happen very often (at least in the files I have) but it is still annoying.
I converted directories full of hundreds of files in one go by simply running this little script from inside that directory:
for wmffile in *.WMF
wmf2svg --wmf-fontdir=/usr/share/fonts/type1/gsfonts $wmffile >$wmffile.svg
Of course it expects that the files' extensions are in capitals, but you can repeat the same code replacing the appropriate line with for wmffile in *.wmf
if you have files with lowercase extensions.
I should have mentioned that I was able to get ImageMagick to work by editing
Searching for "wmf" in the file I found a command template for wmf2eps. I found wmf2svg to be a bit more reliable than wmf2eps so I changed the line to
<delegate decode="wmf" command=""wmf2svg" --wmf-fontdir=/usr/share/fonts/type1/gsfonts -o "%o" "%i""/>