Filename Extensions
If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .123

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

Below, you can find answers to the following questions:

  • What is the .123 file?
  • Which program can create the .123 file?
  • Where can you find a description of the .123 format?
  • What can convert .123 files to a different format?
  • Which MIME-type is associated with the .123 extension?
Lotus 123 Spreadsheet .123 file icon

Lotus 123 Spreadsheet

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
Program name: -
Mime-type: application/x-lotus123
Magic bytes (HEX): -
Magic string (ASCII): -
wk1, wk2, wk3, wks
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

Other types of files may also use the .123 file extension. If you have helpful information about .123 extension, write to us!

Can't open a .123 file?

If you want to open a .123 file on your computer, you just need to have the appropriate program installed. If the .123 association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.123

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2003/2008/2012, Windows 7, Windows 8, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android

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