.WK1 File Extension

Lotus 1-2-3 Spreadsheet

Files with .wk1 extension are Lotus 1-2-3 Worksheets. The wk1 file format contains cells organized in rows and columns to store and analyze data. WK1 files also support charts, graphs, formulas and fu...

General Information

Title WK1 File Extension
Extension .wk1
Full Form Lotus 1-2-3 Spreadsheet
File Type Spreadsheet File
Developer Lotus Development Corporation
MIME Type application/vnd.lotus-1-2-3

File Function

Primary Function Store data
Additional Functions Data analysis, Reporting
Features Cell-based, Formulas, Charts

File Characteristics

Quality Legacy format
Supports Layers No
Supports Transparency No
Editable Yes

Use Cases

Data Storage Yes
Financial Analysis Historical
Data Export Yes

Security and Practices

Security Risks Macro viruses
Best Practices Scan for viruses, Convert to modern formats

Historical/Version Information

Initial Release 1980s
Superseded By .xls, .xlsx

Associated Types

Similar Extensions .123, .xls, .xlsx, .ods

Software Compatibility

Software Usage Policy OS Compatibility
Lotus 1-2-3 Discontinued DOS, Windows
Microsoft Excel Subscription Windows, Mac
LibreOffice Calc Free Windows, Mac, Linux