AAMP
AAMP files are parameter files that are used in many recent Nintendo games such as Breath of the Wild.
Structure
The basic structure of AAMP files is documented on the MK8 wiki.
Unlike some other file formats, AAMP files have the exact same structure and endianness on Wii U and Switch, so theses files are interchangeable between the consoles.
Usage in Breath of the Wild
AAMP files are used in Breath of the Wild to store parameters that define the game's behaviour. They are very frequently used inside .sbactorpack archives, where they define most of an Actor's characteristics.
Extensions
AAMP files have a wide range of extensions. The file format is the same regardless of the extension, but the parameters defines inside it differ depending on the extension.
The following extensions are used in the game:
Tools
The following tools can be used to convert AAMP files to an editable format, and back again: