# Audio compression format developed by Skype — file signature 23 21 53 49 4C 4B 0A at offset 0

For Audio compression format developed by Skype, hex signature is 23 21 53 49 4C 4B 0A; offset is 0; extension is sil, verified against its source on 2026-09-22.

- **Hex signature:** 23 21 53 49 4C 4B 0A _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** sil _(verified: appears in the quote below)_
- **Format:** Audio compression format developed by Skype _(verified: appears in the quote below)_

## What the source says

> 23 21 53 49 4C 4B 0A | #!SILK␊ | 0 | sil | Audio compression format developed by Skype |

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).