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Since smart phones or tablet PCs have been widely used recently , the users can create and edit documents anywhere in real time. If the input and edit flows of documents can be traced, it can be used as evidence in digital forensic investigation. The typical document application is the MS(Microsoft) Office. As th e MS Office applications consist of two file formats that Compound Document File Format which had been used from version 97 to 2003 and OOXML(Office Open XML) File Format which has been used from version 2007 to now. The studies on MS Office files were for making a decision whether the file has been tampered or not through detection of concealed items o r analysis of documents properties so far. This paper analyzed the input order of text cells on MS Excel files and shows how t o figure out what cell is the last edited in digital forensic perspective. Keywords: Digital Forensics, MS Excel, Document File Forensics, OOXML Fi le Format, Compound Document File Format(2013 10 21), (2014 2 14), (2014 3 6)*   2013 ()  -    (2012M3A2A1051106)†, 2yoonmi@korea.ac.kr‡, sangjin@korea.ac.kr(Corresponding author)

A Study on Edit Order of Text Cells on the MS Excel Files