File used by Real Virtuality, a Bohemia Interactive game engine used for games such as Operation Flashpoint, the Armed Assault (ArmA) series, and Virtual Battlespace series (VBS1 and VBS2); contains lip sync information used for NPCs (non-player characters). LIP files are synchronized with a .OGG audio file that is converted from a mono, 16-bit .WAV file using Bohemia Interactive's WavToLip (or "Wav2Lip") program. LIP files must have the same filename prefix as the OGG file. For example, sound1.ogg and sound1.lip are compatible filenames. NOTE: When creating LIP files with WavToLip, the corresponding WAV file must not have whitespace characters in the file path, and the path must be short in length.