I tried to make a patch for this thing but it is half done. The main issue is that exdupe seeks while in stdio, kinda like razor compressor, it is a bit harder to patch something like this plus we have no idea how much it needs to reread from input.
If you test this via Freearc, it will fail but via Cmd it doesn't because Cmd allows seeking while FA doesn't , so if I have free time I'll probably make a full patch for it, a bit busy lately
