The problem i've encountered with this is that i have retextured an existing medal, made the correct tbl entries, and even changed the name of the medal. I can't get the new textures to show up. And they are in the correct format. When i got the medal in the mission, it showed me the old texture on it, but when i went to look in the medal case the game froze, and shut off. Also, nowhere that i can see does it tell you in the tbl which medal goes for which time winning it (1st time received, 2nd time, 3rd)......nor does it allow you to switch the voice file accompanying it (namewise i mean).
So the problem isn't just with adding new medals, it's also with getting the retextured medals recognized with the new textures, and then trying to switch the voice file somehow. At least those are problemns i have encountered.
Now simply renaming the medal in the tbl works just fine. It'll accept and show you the new name. but not new textures. don't know why, so any help on this would rock.