The .sdc file extension is most commonly associated with the OpenOffice and StarOffice Calc spreadsheet applications. These files contain spreadsheets that have been created with these software programs. SDC files can be exported to a variety of spreadsheet applications.
The .sdc file extension is also used for Microsoft Secure Download Cabinet archive files, Smart Diary Suite configuration files, BigPond Music song files, ESRI SDC dataset files and Autodesk stage discharge curve data files.
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If you have additional information about the SDC file format or software that uses files with the SDC suffix, please do get in touch - we would love hearing from you.