FZZ Viewer is a favorite among e-discovery professionals because it does not modify file access times or metadata. When you open an FZZ file in read-only mode, the original "Last Accessed" timestamp remains untouched, preserving the chain of custody.
The name "FZZ Viewer" is slightly deceptive, as the software supports far more than just .fzz extensions. The current version (v3.2.x) handles the following categories: fzz viewer