How to convert a file to CSV?

From Excel to Open Office Calc

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1. Open your file in Excel or Open Office Calc
2. File -> Save As
3. In the "File Format" menu, select "CSV (Windows) (separator: semicolon) (.csv)"

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From Google Sheets

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1. Open your file in Google Sheets
2. File -> Download As
3. Select "Comma-separated values (.csv, current sheet)"
4. If you have more than one sheet, repeat the same operation.

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