WK1 file extension. How to open and convert files with WK1 file suffix

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

There is one other file type using
the WK1 file extension!

.wk1 - Autodesk hydro data

Detailed description

Software that open wk1 file

Add comment

Bookmark & share this page with others:

WK1 file extension - Lotus 1-2-3 version 2.x spreadsheet

What is wk1 file? How to open wk1 files?

File type specification:

Spreadsheet and workbook file type

wk1 file icon:

File extension wk1 is was used for the default document file type in Lotus 1-2-3 version 2.x from early 1990s.

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

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.

Updated: December 1, 2023

The default software associated to open wk1 file:

Lotus 1-2-3

Company or developer:
IBM

IBM Lotus 1-2-3 is spreadsheet application very popular in 80s and 90s of 20th century. It was released for Microsoft Windows, MS-DOS, Mac OS and OS/2. In 2002 IBM stopped the developing of the IBM Lotus 1-2-3. In the latest versions is Lotus 1-2-3 fully compatible with Microsoft Excel.

Help 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.

Find conversions from wk1 file:

Find converter to wk1 file type:

List of software applications associated to the .wk1 file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open wk1 file, edit wk1 file, convert wk1 file, view wk1 file, play wk1 file etc. (if exist software for corresponding action in File-Extensions.org's database).

Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting wk1 files.

Software that open wk1 file - Lotus 1-2-3 version 2.x spreadsheet

Programs supporting the exension wk1 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open wk1 file action.