---
type: lookup
id: isz-49-73-5a-21
asset: file-format-signatures
title: "49 73 5A 21 — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "indows Virtual PC Windows 8 Virtual Hard Disk file format | 49 73 5A 21 | IsZ! | 0 | isz | Compressed <https://en.wikipedia.org/wiki/ISO_image> ISO image | 44 41 41 | DAA | 0 | daa | <https://en.wikipedia.org/wiki/Direct_Access_Archive> Direct Access Archive PowerISO | 4C 66 4C 65 | LfLe | 0 | evt | Windows <https://en.wikipedia.org/wiki/Event_Viewer> Event"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "49 73 5A 21"
offset: "49"
extension: "isz"
format: "Compressed ISO image"
unverified_fields: format
---
**Hex signature:** 49 73 5A 21

**Offset:** 49

**Extension:** isz

**Format:** Compressed ISO image

> indows Virtual PC Windows 8 Virtual Hard Disk file format | 49 73 5A 21 | IsZ! | 0 | isz | Compressed <https://en.wikipedia.org/wiki/ISO_image> ISO image | 44 41 41 | DAA | 0 | daa | <https://en.wikipedia.org/wiki/Direct_Access_Archive> Direct Access Archive PowerISO | 4C 66 4C 65 | LfLe | 0 | evt | Windows <https://en.wikipedia.org/wiki/Event_Viewer> Event 

Source: <https://en.wikipedia.org/wiki/List_of_file_signatures>