Convert SXC to XLS

A legacy reporting system, business application, or older Excel installation may accept only .xls files. Converting an .sxc workbook produces an Excel 97–2003-compatible file that can be edited without the original OpenOffice suite.

What the SXC format is

SXC is the spreadsheet format used by OpenOffice.org Calc 1.x and StarOffice 6/7. It stores cell data, formulas, formatting, charts, and workbook settings in an older OpenOffice XML package. SXC files are common in older office archives, Linux-based document collections, and exports from StarOffice or OpenOffice.org before ODS became the standard format.

Renaming .sxc to .xls does not convert the file; the internal format remains unchanged.

What the XLS format is

XLS is Microsoft Excel’s binary workbook format, used primarily by Excel 97–2003. It remains useful when a legacy application, reporting system, document-management platform, or older Microsoft Office installation cannot read XLSX or ODS files.

XLS has broad compatibility with older spreadsheet software, but each worksheet is limited to 65,536 rows and 256 columns. Use XLS for compatibility requirements rather than as the preferred format for new or archival workbooks.

Using LibreOffice Calc

1. Install LibreOffice for Windows, macOS, or Linux.
2. Open the .sxc file in Calc. If Calc displays a format or compatibility warning, continue opening the file.
3. Select File → Save As.
4. Choose Excel 97–2003 (*.xls) as the file type and save the workbook with an .xls extension.
5. When Calc warns that some features may be lost, confirm Use Excel 97–2003 Format or the equivalent option.
6. Reopen the saved file in Calc or Excel and check formulas, sheet layout, charts, named ranges, and print settings.

For batch conversion, use LibreOffice’s command-line mode:

soffice --headless --convert-to xls --outdir output workbook.sxc

Create the output directory first and quote paths containing spaces. The command preserves the original file and writes the converted workbook to the specified directory. For a particular LibreOffice installation, the exact Excel filter can also be specified as --convert-to xls:"MS Excel 97".

Using Apache OpenOffice

Apache OpenOffice Calc can open SXC files and save them through File → Save As. Select Microsoft Excel 97/2000/XP (.xls) as the file type, then accept the compatibility warning. LibreOffice is usually the better first choice because it receives more frequent compatibility updates, but Apache OpenOffice remains suitable for many legacy SXC files.

Using an online converter

Services such as CloudConvert and Zamzar may provide browser-based SXC-to-XLS conversion. Upload the workbook, select XLS as the output format, start the conversion, and download the result.

Use online conversion only for files that can be disclosed to a third party. Financial, personal, confidential, or regulated workbooks should be converted locally because uploaded files may be stored temporarily, processed in the cloud, or subject to the provider’s retention policy.

Compatibility limitations

SXC and XLS use different spreadsheet implementations, so conversion can alter formatting, formulas, column widths, page breaks, charts, named ranges, external links, and print areas. Review conversion warnings and compare calculated results with the original workbook.

OpenOffice Basic macros do not automatically become working VBA macros in XLS. External links may need to be relinked, and features exceeding the XLS row or column limits cannot be preserved. If the receiving software supports newer formats, ODS or XLSX is generally more suitable for ongoing editing and archiving; choose XLS when compatibility with legacy software is the requirement.