File Extension 123

  • Full name
    Lotus 1-2-3 Spreadsheet Format
  • Developer
  • Popularity
Have you encountered a problem with a 123 file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a 123 file here. In the further part of this page we have added a list of programs that should open your 123 file. It is enough you choose a proper application for your operating system, download and install it.


The extension 123 is used by the spreadsheet program Lotus 1-2-3 of the Lotus Office Suite for Spreadsheets.

Lotus 1-2-3 is still used quite often today and is still available despite years of discontinued development with the IBM Lotus Smartsuite. 123 files can also be imported into some other spreadsheet applications. 123 files can be imported depending on the version of older versions of Excel, Excel 2007 and higher are not able to do so.

Programs which can open a 123 file

How to open a 123 file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the 123 file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a 123 file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support 123 files. At this point we are looking for disk space where the application was installed in and we can link it with a 123 file. Since then, our operating system will use the selected program to support all 123 files.

Other issues

Despite the described problem with 123 there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the 123 file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the 123 file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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