WowAce

It looks like OpenType fonts are also supported by the game client, but they are not detected by the batch script

http://www.mmo-champion.com/threads/2190055-ElvUI_CustomMedia-Addon

for %%F in (..\SharedMedia_MyMedia\font\*.ttf) do (
echo       %%~nF
echo LSM:Register("font", "%%~nF", [[Interface\Addons\SharedMedia_MyMedia\font\%%~nxF]]^) >> ..\SharedMedia_MyMedia\MyMedia.lua
)