OpenOffice Calc 1.0
Readablespreadsheet · also known as StarOffice Calc (6.0)
All OpenOffice v1.0 documents (Calc, Draw, Impress, Writer) use the extenele Markup Language (XML) for representing the elements and attributes of each structural component of the document. As XML has no native support for binary objects, OpenOffice.org files use a standard Zip file to store the XML content together with its associated binary data. Information about the files contained in the Zip file is stored in an XML file called the manifest file. The manifest file is always stored at the pathname META-INF/manifest.xml. The manifest file contains a list of all the files in the Zip file, the media type of each file, and the information necessary to decrypt any encrypted files included in the Zip file.
Identify it
| Extensions | .sxc |
|---|---|
| MIME types | application/vnd.sun.xml.calc |
| Signatures | 504b0304140000000000 at byte 0 (OpenOffice Calc 1.0) |
| PRONOM | fmt/129 |
| Wikidata | Q29944551 |
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Open it
- LibreOfficeOpen source
Convert it
| To | With | Fidelity | Command and losses |
|---|---|---|---|
| Microsoft Excel for Windows 2007 onwards | LibreOffice | Partial | soffice --headless --convert-to xlsx in.sxcLayout may shift; macros and some features are not kept. |
| OpenDocument Spreadsheet file format family | LibreOffice | Partial | soffice --headless --convert-to ods in.sxcLayout may shift; macros and some features are not kept. |
| LibreOffice | Partial | soffice --headless --convert-to pdf in.sxcFixed layout: the document is no longer editable. | |
| Comma Separated Values | LibreOffice | Lossy | soffice --headless --convert-to csv in.sxcFirst sheet only, values only: formulas, formatting and other sheets are lost. |
Sources
From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), PRONOM, Wikidata. Updated 2026-10-20.