# 4D 5A — File format magic numbers

For 4D 5A, offset is 0; extension is exe; format is DOS MZ executable, recorded from its source on 2026-08-03.

- **Hex signature:** 4D 5A _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0
- **Extension:** exe
- **Format:** DOS MZ executable

## What the source says

> MZ | 0 | exe dll mui sys scr cpl ocx ax iec ime rs tsp fon efi | <https://en.wikipedia.org/wiki/DOS_MZ_executable> DOS MZ executable and its descendants (including <https://en.wikipedia.org/wiki/New_Executable> NE and <https://en.wikipedia.org/wiki/Portable_Executable> PE )

## 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/).