---
type: lookup
id: item-53-5a-44-44-88-f0-27-33
asset: file-format-signatures
title: "53 5A 44 44 88 F0 27 33 — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "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_’. |"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "53 5A 44 44 88 F0 27 33"
offset: "0"
extension: "?? _"
format: "Microsoft compressed file in Quantum format"
unverified_fields: format, hex_signature
---
**Hex signature:** 53 5A 44 44 88 F0 27 33

**Offset:** 0

**Extension:** ?? _

**Format:** Microsoft compressed file in Quantum format

> 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>