Which document format is NOT typically analyzed by FTK?

The analysis capabilities of FTK (Forensic Toolkit) focus primarily on structured document formats that contain textual and image-based data, such as PowerPoint presentations, Word documents, and PDF files. These formats are commonly encountered in digital investigations due to their frequent use for documentation and presentation purposes.

Audio files, on the other hand, do not contain the same textual structure and metadata characteristics that FTK is designed to analyze effectively. While FTK may have some ability to handle audio files in terms of basic recovery, it is not typically utilized for in-depth analysis of sound data, as its primary function revolves around the analysis of files that convey information in a more text-centric and visually structured manner. Thus, the correct choice reflects the limitation of FTK's primary analysis capabilities in relation to audio files.