# DOS MZ executable and its descendants (including NE and PE) — file signature 4D 5A at offset 0

For DOS MZ executable and its descendants (including NE and PE), hex signature is 4D 5A; offset is 0; extension is exe dll mui sys scr cpl ocx ax iec ime rs tsp fon efi, verified against its source on 2026-09-22.

- **Hex signature:** 4D 5A _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** exe dll mui sys scr cpl ocx ax iec ime rs tsp fon efi _(verified: appears in the quote below)_
- **Format:** DOS MZ executable and its descendants (including NE and PE) _(verified: appears in the quote below)_

## What the source says

> 4D 5A | MZ | 0 | exe dll mui sys scr cpl ocx ax iec ime rs tsp fon efi | DOS MZ executable and its descendants (including NE and PE) |

## Source

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

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).