We have found 4 software records in our database eligible for .123 to .xlsx file format conversion.
Opening or even conversion of old Lotus 1-2-3 spreadsheets (.123) can be a little tricky in modern spreadsheet editors. However, some (mainly open source) programs, such as Calc programs from Ooo or LibreOffice, should still be able to open and possible re-save .123 files to other formats.
Updated: October 4, 2018
123
A 123 file extension is related to the IBM Lotus 1-2-3, a spreadsheet software and used for its spreadsheet files.
XLSX
An xlsx file extension is used by Microsoft Excel for its workbooks (spreadsheets) in Office Open XML format. XLSX is the latest spreadsheet format used by Excel with adoption of XML formatting first used in Office 2000. While older xls files were binary in nature, xlsx spreadsheets are using somewhat altered XML scheme.
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