Audacity 3.0.0 replaces .aup with a new .aup3 file format that holds everything in a project including your audio files. That means .aup3 files will be much larger than .aup files.

Though Photoshop doesn't directly open InDesign project files, the two programs are closely related. Both are part of Adobe's Creative Suite 6 package, so the programs share common file formats.

Photoshop is one example of a program that can open PSF files, but several other apps use PSF files for unrelated purposes ...