# Lotus 1-2-3 spreadsheet (v9) file — file signature 00 00 1A 00 05 10 04 at offset 0

For Lotus 1-2-3 spreadsheet (v9) file, hex signature is 00 00 1A 00 05 10 04; offset is 0; extension is 123, verified against its source on 2026-09-22.

- **Hex signature:** 00 00 1A 00 05 10 04 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** 123 _(verified: appears in the quote below)_
- **Format:** Lotus 1-2-3 spreadsheet (v9) file _(verified: appears in the quote below)_

## What the source says

> 00 00 1A 00 05 10 04 | ␀␀␚␀␅␊␄ | 0 | 123 | Lotus 1-2-3 spreadsheet (v9) file |

## 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/).