What does WK4 stand for?

MLA style: "WK4." Acronym Finder . 2012. AcronymFinder.com 31 May. 2012 <a href="http://www.acronymfinder.com/Lotus-123-Spreadsheet-File-(file-extension)-(WK4).html">http://www.acronymfinder.com/Lotus-123-Spreadsheet-File-(file-extension)-(WK4).html
Chicago style: Acronym Finder . S.v. "WK4." Retrieved May 31 2012 from <a href="http://www.acronymfinder.com/Lotus-123-Spreadsheet-File-(file-extension)-(WK4).html">http://www.acronymfinder.com/Lotus-123-Spreadsheet-File-(file-extension)-(WK4).html
APA style: WK4. (n.d.) Acronym Finder. (2012). Retrieved May 31 2012 from <a href="http://www.acronymfinder.com/Lotus-123-Spreadsheet-File-(file-extension)-(WK4).html">http://www.acronymfinder.com/Lotus-123-Spreadsheet-File-(file-extension)-(WK4).html

Lotus 123 Spreadsheet File (file extension)

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