# 53 5A 44 44 88 F0 27 33 — File format magic numbers

For 53 5A 44 44 88 F0 27 33, offset is 0; extension is ?? _; format is Microsoft compressed file in Quantum format, recorded from its source on 2026-08-03.

- **Hex signature:** 53 5A 44 44 88 F0 27 33 _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0
- **Extension:** ?? _
- **Format:** Microsoft compressed file in Quantum format _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> SZDDˆð'3 | 0 | ?? _ | Microsoft compressed file in <https://en.wikipedia.org/wiki/Data_compression> Quantum format, used prior to Windows XP. File can be decompressed using Extract.exe or Expand.exe distributed with earlier versions of Windows. After compression, the last character of the original filename extension is replaced with an <https://en.wikipedia.org/wiki/Underscore> underscore , e.g. ‘Setup.exe’ becomes ‘Setup.ex_’. |

## 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/).