opening.bnr is a file related to Wii homebrew development.


It is a normal ARC-file (archive) with an extra header.

The ARC-file contains 3 files:

  • banner.bin
  • icon.bin
  • sound.bin

These .bin-files are compressed using the LZ77 encryption, more information on Wikipedia.

The extra header is very similar (possibly identical?) to the part A of the content.bin file, starting from (and including) the field Zeroes_1, i.e. the second block of part A.

See Content.bin file structure.