# 4A 6F 79 21 — File format magic numbers

For 4A 6F 79 21, offset is 0; format is Preferred Executable Format, recorded from its source on 2026-08-03.

- **Hex signature:** 4A 6F 79 21 _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0 _(unconfirmed — we could not tie this to the quote below)_
- **Format:** Preferred Executable Format

## What the source says

> <https://en.wikipedia.org/wiki/Preferred_Executable_Format> Preferred Executable Format

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-08-03. Review by: 2027-08-03.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).