What is an AUP file?
A .AUP file is primarily an Audacity Project File created by the free audio editor Audacity. It does not contain actual sound data. Instead, it saves project settings, track edits, and references to audio blocks. These audio blocks are stored in a separate `_data` folder. Other software systems also use the .AUP extension. It can be a video project file for AviUtl, a medical radiography raw image for Agfa HealthCare or Rayence, or a firmware update package for ASIC cryptocurrency miners like Canaan AvalonMiner.
How to open AUP files?
You can open standard Audacity Project Files using Audacity. You must keep the .AUP file and its matching `_data` folder in the exact same location. Otherwise, the software cannot load your audio. If you have an AviUtl video project, use AviUtl. Because .AUP has multiple possible meanings, we recommend using viewer.online/aup to identify the actual format of your file.
Best practices and troubleshooting
A common mistake is sending only the .AUP file to another person. Without the `_data` folder, the recipient cannot hear the audio. To share playable audio, you must export the project from Audacity as an .MP3 or .WAV file. If your file will not open, viewer.online/aup analyzes .AUP files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Summary
Because .AUP files most commonly use the known XML format, viewer.online/aup can safely open and display them online, eliminating compatibility problems.