A daily updated filename extension database!

123 file extension

The table below provides useful information about the .123 file extension. It answers questions such as:

  • What is the .123 file?
  • What program do I need to open a .123 file?
  • How can the .123 file be opened, edited or printed?
  • How can I convert .123 files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Lotus 123 Spreadsheet

Lotus 123 Spreadsheet .123 file icon
123 file is a Lotus 1-2-3 Spreadsheet. Lotus 1-2-3 is a spreadsheet program designed for IBM-compatible personal computers by Lotus Corporation in 1982.
Category: Document files
Application: Lotus 1-2-3
Mime-type: application/x-lotus123
Magic number: -
Magic string: -
Sample: -
123 aliases:
wk1, wk2, wk3, wks
123 related links:
123 related extensions:
Comma-Delimited ASCII File

Comma-Separated Values

ClarisWorks Document

Data Interchange Format

Microsoft Word Document

Lotus Word Pro Document

Microsoft Word for Macintosh Document

Data Interchange Format

Microsoft PowerPoint Presentation

Revisable-Form Text

Other types of files may also use the .123 file extension.

🔄 .123 converters

The following softwares are capable of converting .123 files to other formats:


For example, using the softwares above, a .123 file can be converted into one of the following formats:

dxf, ott, xltx, wb2, dotm, xlm, xbm, sxm, xpm, wmf, sxc, docm, stc, svm, doc

🔴 Can't open a .123 file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .123 file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .123 file extension, write to us!

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