123 File - opening and understanding

Did your computer fail to open a 123 file? We explain what they are used for and recommend software that we know can open or otherwise handle 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.

How to open 123 files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension 123 for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 10 different 123 openers which you will find listed below.

Suggest another file format using extension 123

While we know of one file format using the .123 file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .123 file.

Various viewers for this file format

These apps are known to open certain types of 123 files. Remember, different programs may use 123 files for different purposes, so you may need to try out a few of them to be able to open your specific file.

OpenOffice.org CalcOpenOffice.org CalcUser submitted
LibreOfficeLibreOfficeUser submitted
LibreOffice CalcLibreOffice CalcUser submitted
StarOffice CalcStarOffice CalcUser submitted
Microsoft OfficeMicrosoft OfficeUser submitted
Microsoft ExcelMicrosoft ExcelUser submitted
OpenOffice.org BaseOpenOffice.org BaseUser submitted
Stuffit ExpanderStuffit ExpanderUser submitted
OOo4Kids CalcOOo4Kids CalcUser submitted
PCB123PCB123User submitted
We have not verified any software that we know for certain will work with 123-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with 123-files. If you know one, please use the 'Suggest a program' link below and tell us about it!