Having problems opening a 123 file?

We have programs that can open or convert your 123 files.

Opening 123 files

Did your computer fail to open a 123 file? We explain what 123 files are and recommend software that we know can open or convert your 123 files.

What is a 123 file?

Files that contain the .123 file extension are most commonly used by the Lotus 1-2-3 spreadsheet software application. The program was initially developed by Lotus, which was later acquired by IBM. The spreadsheet application was most popular in the mid 1980s. Over the years, the popularity of the Lotus 1-2-3 application was replaced by Microsoft's Excel.

The 123 files that are created by the Lotus 1-2-3 program contain spreadsheet data files that have been created within the software.

The .123 file extension is also used for circuit board designs that have been created by the PCB123 circuit board prototype tool.

Try a universal file viewer

Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.

About File Extension 123

File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.

If you have additional information about the 123 file format or software that uses files with the 123 suffix, please do get in touch - we would love hearing from you.