# 46 4F 52 4D ?? ?? ?? ?? 43 4D 55 53 — File format magic numbers

For 46 4F 52 4D ?? ?? ?? ?? 43 4D 55 53, offset is 0; extension is cmus; format is Musical Score, recorded from its source on 2026-08-03.

- **Hex signature:** 46 4F 52 4D ?? ?? ?? ?? 43 4D 55 53 _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0
- **Extension:** cmus
- **Format:** Musical Score

## What the source says

> 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

Last verified: 2026-08-03. Review by: 2027-08-03.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).