---
type: lookup
id: com-c9
asset: file-format-signatures
title: "C9 — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "<https://en.wikipedia.org/wiki/COM_file_(CP/M)> CP/M 3 and higher with overlays [ 27 ]"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "C9"
offset: "0"
extension: "com"
format: "<https://en.wikipedia.org/wiki/COM_file_(CP/M)> CP/M 3 and higher with overlays"
unverified_fields: hex_signature, offset
---
**Hex signature:** C9

**Offset:** 0

**Extension:** com

**Format:** <https://en.wikipedia.org/wiki/COM_file_(CP/M)> CP/M 3 and higher with overlays

> <https://en.wikipedia.org/wiki/COM_file_(CP/M)> CP/M 3 and higher with overlays [ 27 ]

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