What Are 123 Files and How To Open Them? (Updated 2026)

.123 File Overview

File Extension:	123
File Type Description:	Lotus 1-2-3 Spreadsheet
File Type Developer:	IBM
Primary Associated Software:	Apache OpenOffice
Primary Software Developer:	Apache Software Foundation

Open your files with FileViewPro File Viewer

Download File Opener

123

Optional Offer for FileViewPro by Solvusoft | EULA | Privacy Policy | Terms | Uninstall

Home File Types Spreadsheet Files 123

What is File Extension 123?

Open Source developed the 123 file extension, also know as a Lotus 1-2-3 Spreadsheet file, for the Gnumeric software package. Annoymous user data statistics infer that 123 files are most popular in United States and with those using Windows 10 devices. A high percentage of these users browse the web using Google Chrome.

Associated Developers and Software

	Gnumeric by Open Source
	PCB123 by Sunstone Circuits
	Lotus 1-2-3 by IBM
	NeoOffice by Planamesa Software Inc.
	Apache OpenOffice by Apache Software Foundation

Top 123 User Languages

Top 123 File User Browsers

Desktop Friendly?

Mobile Friendly?

Top User Operating Systems


Windows 10	Windows 11	Windows 6	Windows 8.1

Associated Operating Systems

	Windows
	Mac
	Android
	Linux

Other File Types Related to 123 Files

Extension	File Type Developer	File Category	File Type Description
.WR!	IBM	Spreadsheet Files	Lotus 1-2-3 Spreadsheet
.WK!	IBM	Spreadsheet Files	Lotus 1-2-3 Spreadsheet
.ICF	Zoom Telephonics	Backup Files	Zoom Router Configuration File
.FTL	Apache Software Foundation	Developer Files	FreeMarker Template File
.HTACCESS	Apache Software Foundation	Web Files	Apache HTACCESS File
.SDP	Oracle Corporation	Data Files	StarOffice Presentation File
.PSW	Microsoft Corporation	Uncommon Files	Windows Password Reset Disk File
.SXD	ESRI	GIS Files	ArcScene Document
.SDS	Oracle Corporation	Data Files	OpenOffice.org Chart
.SXI	Oracle Corporation	Data Files	StarOffice Impress Presentation