.wk1 Lotus 1-2-3 spreadsheet
Documents & office
| MIME type | application/vnd.lotus-1-2-3 |
|---|---|
| Description | Lotus 1-2-3 spreadsheet |
| Category | Documents & office |
| Signature (magic bytes) | 00 00 02 00 06 04 06 00 08 00 00 00 00 00 (..............) |
| Other extensions | .123, .wk3, .wk4, .wks |
Frequently asked questions
What is a .wk1 file?
A .wk1 file is a “Lotus 1-2-3 spreadsheet” (MIME type application/vnd.lotus-1-2-3).
How do I open a .wk1 file?
With an office suite: LibreOffice (free, Windows/macOS/Linux) opens most document formats, as do Microsoft Office or the vendor’s own app.
How can you tell a genuine .wk1 file?
By the bytes at the start of the file, the signature (magic bytes): 00 00 02 00 06 04 06 00 08 00 00 00 00 00 (..............). On Linux and macOS, file --mime-type example.wk1 checks the real type regardless of the extension.
Which MIME type belongs to .wk1?
The MIME type is application/vnd.lotus-1-2-3. In the Apache web server: AddType application/vnd.lotus-1-2-3 .wk1; in nginx: types { application/vnd.lotus-1-2-3 wk1; }.