Files with the .sxc extension are most commonly associated with the StarOffice Calc spreadsheet software application. StarOffice Calc is similar to Microsoft Excel and supports formulas, charts, functions and macros. The spreadsheets created with this software are saved with the .sxc file extension.
The .sxc file extension is also used for OpenOffice.org Calc spreadsheet files and HPXView SONET/SDH Crossconnect configuration files.
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If you have additional information about the SXC file format or software that uses files with the SXC suffix, please do get in touch - we would love hearing from you.