# Lotus 1-2-3 spreadsheet (v4, v5) file — file signature 00 00 1A 00 02 10 04 00 00 00 00 00 at offset 0

For Lotus 1-2-3 spreadsheet (v4, v5) file, hex signature is 00 00 1A 00 02 10 04 00 00 00 00 00; offset is 0; extension is wk4 wk5, verified against its source on 2026-09-22.

- **Hex signature:** 00 00 1A 00 02 10 04 00 00 00 00 00 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** wk4 wk5 _(verified: appears in the quote below)_
- **Format:** Lotus 1-2-3 spreadsheet (v4, v5) file _(verified: appears in the quote below)_

## What the source says

> 00 00 1A 00 02 10 04 00 00 00 00 00 | ␀␀␚␀␂␊␄␀␀␀␀␀ | 0 | wk4 wk5 | Lotus 1-2-3 spreadsheet (v4, v5) 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/).