System/Library/PrivateFrameworks/OfficeImport.framework
OADWavAudioFile.h
@interface OADWavAudioFile : OADEmbeddedMediaFile
@property (nonatomic) float duration;
@property (nonatomic) BOOL hasDuration;
- (BOOL)isAudioOnly;
- (void)setIsAudioOnly:(BOOL)a0;
@end