Thats strange, let me see what I can figure out...

Edit: I made another cab using the cpr's from one of my other fonts without the code for opera and it still did the same thing. I have no idea how it changed the file explorer font nor a way to get it back to normal (luckily I like how it looks lol). Try installing the font that I posted for Dro on the previous page just to see if it works for the opera panel for you. If it does I can try and get the other font you gave me to work.