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What is a .wk1 file?
A .wk1 file is a Lotus 1-2-3 Worksheet (version 2.0). This one is a specialist format without an obvious everyday home.
How to open a .wk1 file
- The program that created it is by far the most reliable way to open it.
- On Windows, use a hex viewer or the free TrID tool to identify what the file really is.
- On Mac or Linux, running `file yourfile` in the terminal identifies most formats instantly.
The registry records this extension against Lotus 1-2-3 Worksheet, so software from that family is the most likely match.
How to convert a .wk1 file
- Identify the file first, then look for an export or Save As option in whatever program can read it.
MIME type
When a .wk1 file travels over the web, servers label it with one of these MIME types:
application/vnd.lotus-1-2-3application/x-123The technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .wk1.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| Lotus 1-2-3 Worksheet | 2.0 | application/vnd.lotus-1-2-3, application/x-123 | x-fmt/114 |