is an executable file associated with Microsoft’s Family Safety feature, which is part of the Microsoft Family parental control system. The name itself is a clue: "FHG" likely refers to Fraunhofer IIS (the developers of the MP3 and AAC codecs), "AAC" stands for Advanced Audio Coding, and "ENC" stands for Encoder.
: The tool performs a high-speed pre-scan of the audio to identify silent gaps or simple harmonic sections (like solo vocals vs. full orchestral swells).