Opening a WK1 File

The WK1 file type is primarily associated with Lotus 1-2-3.

WK1	File extension: WK1
	File type:	spreadsheet

What is a WK1 file?

WK1 files mostly belong to Lotus 1-2-3. This WK1 file is a Lotus 1-2-3 spreadsheet file that stores data in a grid format, including numbers, text, and formulas.
If you have a WK1 file, you are dealing with a legacy spreadsheet that was widely used in business and data analysis. It organizes data much like modern spreadsheets but uses an older internal format that preserves cell structure and calculation details.
Useful points include:

Data storage: Holds cells, formulas, and formatting information.
Legacy support: Was chiefly used in Lotus 1-2-3 applications.
Conversion potential: Can be imported into modern spreadsheet software or converted to newer formats.

FilExt.com tip: For more background on Lotus 1-2-3 and its evolution, visit IBM.

How to open WK1 files

You need a suitable software like Lotus 1-2-3 to open a WK1 file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your WK1 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a WK1 file directly in the browser:. Just drag the file onto this browser window and drop it.

Online WK1 File Viewer

Choose your .wk1 file to view

or drag and drop it here

Online File Viewer

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How do you convert WK1 files to XLS, XLSX, ODS, CSV, TXT, PDF, ...

If you want to convert or edit a WK1 file, you can use our free Online WK1 File Converter (powered by Convert.Guru):

To do this, click the button "Choose your .wk1 file to view" on this page.
Your WK1 file will then be displayed in the browser.
Now click on "Save as..." at the top of the page.
Then choose the desired spreadsheet format (e.g. XLS, XLSX, ODS, CSV, TXT, PDF, ...).
Your file will be converted and downloaded.

Programs that open and convert WK1 files:

Lotus 1-2-3
See the previous paragraphs to learn more about the main application. WK1 files are often referred to as Lotus 1-2-3 spreadsheets because this type of file is primarily created or used by this software.
1-2-3 (Spreadsheet File) by IBM
Lotus 1-2-3 versions 1 & 2 spreadsheet. This was a Lotus product. Lotus was bought out by IBM. The Mime types used with this association are: application/vnd.lotus-1-2-3, application/x-123, application/lotus123, application/x-lotus123, application/wk1, application/vnd.ms-excel, zz-application/zz-winassoc-wk1. The identifying characters used for this association are - Hex: 00 00 02 00 06 04 06 00 08 00 00 00 00 00.

WK1 file extension format:

If you can determine the file format, the associated program can also be determined. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. File extension, signature and file format must match; otherwise errors will occur when the file is opened. So you need a detailed analysis of a file to find out the format and the associated program. In the following you will find our evaluation of the WK1 files:

An WK1 file predominantly uses a uniform format. The two most common formats are as follows:

95% of all WK1 files are Lotus 123/Symphony Worksheet files. They consist of illegible, cryptic characters. The average file size is 14 KB with most files being between 3 KB and 120 KB in size. The file type is very old and rarely used today. Files like these are sometimes connected to budget, pled and trin.

All other WK1 files (5%) have no uniform format. Sometimes used for book. If you want to find out which format your WK1 file belongs to, just click on the button "Choose your .wk1 file to view".

Technical Data for WK1 File Extension

File classification:

Spreadsheet

Identifier:

Hex: 00 00 02 00 06 04 06 00 08 00 00 00 00 00 (provided by TrID database)

Related files:

wk3, wk4, xlsx, ods, xlt, xlam, wk3, fmt, wk%21, wk!, wks, wr1, wb2, file, zip, fm1, xls, csv

Mime type:

application/vnd.lotus-1-2-3, application/x-123, application/lotus123, application/x-lotus123, application/wk1, application/vnd.ms-excel, zz-application/zz-winassoc-wk1

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: 123Worksheet
EXEFile: C:\lotus\123\123w.exe %1

ProgramID: MoreInfo
EXEFile: %ProgramFiles%\Netzip Classic\MoreInfo.exe %l

ProgramID: wk1file
EXEFile: %ProgramFiles%\Verity\KVLotus\KVLOTUS.EXE %1

ProgramID: 123Worksheet
EXEFile: %ProgramFiles%\lotus\123\123w.exe %1

ProgramID: Pagis.EDoc
EXEFile: %ProgramFiles%\ScanSoft\Pagis\EDocView.exe

Show all 5 listings To Top

a wk1 spreadsheet is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with WK1 files

Associate the WK1 file extension with the correct application.
Update your software that should actually open spreadsheets. Because only the current version supports the latest WK1 file format. Search, therefore, e.g. on the manufacturer website after an available Lotus 1-2-3 update.
To make sure that your WK1 file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .WK1 file online - secure, fast, and no downloads needed.