The Meaning of .XS3 Files and How To Open Them

An XS3 file is most commonly understood to be an old spreadsheet or worksheet file created by XESS, a legacy spreadsheet program. In simple terms, that means the file was meant to store spreadsheet-style information such as rows and columns of data, formulas, labels, values, and possibly technical or engineering calculations. XESS itself was a spreadsheet application used on systems …

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