Files with 123 extension can be fe mostly found as old spreadsheets from IBM Lotus 1-2-3 spreadsheet software.

There is one other file type using
the 123 file extension!

empty icon.123 - PCB123 circuit board design

Detailed description

Software that open 123 file

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123 file extension - Lotus 1-2-3 spreadsheet

What is 123 file? How to open 123 files?

File type specification:

Spreadsheet and workbook file type icon Spreadsheet and workbook file type

123 file icon: 123 filetype icon

File extension 123 is associated with Lotus 1-2-3, a highly popular spreadsheet program sold by IBM in mids 80s. It was eventually discontinued when Excel took its dominant place on the market.

A .123 files were used by some versions of Lotus 1-2-3 for their saved spreadsheets.

MIME types:

This 123 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: November 21, 2023

The default software associated to open 123 file:

Lotus 1-2-3 icon

IBM logoLotus 1-2-3  Microsoft Windows software

Company or developer:

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:

Some spreadsheets might be able to import *.123, but the format is very rare.

How to convert:

Some programs still support the old Lotus 1-2-3 formats and can convert them.

Find conversions from 123 file:

123 to csv

123 to doc

123 to pdf

123 to wk1

123 to wk4

123 to xls

123 to xlsx

Find converter to 123 file type:

prn to 123

tab to 123

tmd to 123

wg1 to 123

wk1 to 123

wki to 123

wks to 123

List of software applications associated to the .123 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 123 file, edit 123 file, convert 123 file, view 123 file, play 123 file etc. (if exist software for corresponding action in's database).

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 123 files.

Software that open 123 file - Lotus 1-2-3 spreadsheet

Programs supporting the exension 123 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open 123 file action.

Microsoft Windows:

Main software associated with 123 file by default:
Lotus 1-2-3 small icon Lotus 1-2-3
Other suggested software:
Corel Quattro Pro small icon Corel Quattro Pro

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