---
type: lookup
id: cmus-46-4f-52-4d-43-4d-55-53
asset: file-format-signatures
title: "46 4F 52 4D ?? ?? ?? ?? 43 4D 55 53 — File format magic numbers"
sources:
  - https://en.wikipedia.org/wiki/List_of_file_signatures
source_quote: "FORM ???? CMUS | 0 any | cmus mus iff | <https://en.wikipedia.org/wiki/Interchange_File_Format> IFF <https://en.wikipedia.org/wiki/IFF_Musical_Score?action=edit&redlink=1> Musical Score"
generated: true
verified: false
harvested: 2026-08-03
stale_after: 2027-08-03
hex_signature: "46 4F 52 4D ?? ?? ?? ?? 43 4D 55 53"
offset: "0"
extension: "cmus"
format: "Musical Score"
unverified_fields: hex_signature
---
**Hex signature:** 46 4F 52 4D ?? ?? ?? ?? 43 4D 55 53

**Offset:** 0

**Extension:** cmus

**Format:** Musical Score

> FORM ???? CMUS | 0 any | cmus mus iff | <https://en.wikipedia.org/wiki/Interchange_File_Format> IFF <https://en.wikipedia.org/wiki/IFF_Musical_Score?action=edit&redlink=1> Musical Score

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