A .BZA file can represent totally different structures because software authors can assign the extension freely; many BZAs behave like IZArc/BGA archives, while others are specialized or proprietary containers, so…
Fast & Secure DD File Opening – FileMagic
A “.DD file” isn’t one universal format—it’s simply a file extension that different tools and software reuse for different purposes, so what it actually contains depends on where it came…