.WK1 File

The wk1 file extension is associated with Lotus 1-2-3 version 2.x and used for spreadsheet documents..

The wk1 files were used as the default spreadsheet format of  Lotus 1-2-3 version 2.x including, rows and columns, formulas etc.

Lotus 1-2-3 is a discontinued product.

MIME types:
application/vnd.lotus-1-2-3
application/x-123,
application/lotus
application/x-lotus123
zz-application/zz-winassoc-123

This wk1 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Files with wk1 file extension are spreadsheets saved in old Lotus 1-2-3 office program. These files were used in version 2.X.

How to open:

Use Lotus 1-2-3 version 2.x or later to open the .wk1 files.Also some modern spreadsheets programs can still open the .wk1 files. However the latest versions of Microsoft Excel from version 2007 no longer support that format. You can have luck with any earlier version of Excel, but you will probably lose most of the formatting from the .wk1 files.

How to convert:

You can open *.wk1 in Microsoft Excel and save it to another file format. You will probably lose formatting.