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The Au file format is a simple audio file format introduced by Sun Microsystems. The format was common on NeXT systems and on early Web pages. Originally it was headerless, being simply 8-bit Âµ-law-encoded data at an 8000 Hz sample rate. Hardware from other vendors often used sample rates as high as 8192 Hz, often integer factors of video clock signals.
Audacity project file. AUP is a file extension for a project file used by Audacity audio software. AUP files contain audio project information and settings, and correspond with a .DAT file of the same name that contains that audio data referenced in the project file. AUP files can be opened by Audacity on Windows, Linux or Mac OS X.