.docx = is a handy tool for viewing Word 2007,2010 document without any version of MS Word. Microsoft adopts new format DOCX instead of traditional DOC in MS Word.
.csv = a comma separated values file, which allows data to be saved in a table structured format.
.rtf = a text file format used by Microsoft products, such as Word and Office
.txt = a file extension for a text file
.xls = a file extension for a spreadsheet file format created by Microsoft for use with Microsoft Excel. XLS stands for eXceL Spreadsheet.
.pdf = a file format for capturing and sending electronic documents in exactly the intended format.
.csv = a comma separated values file, which allows data to be saved in a table structured format.
.rtf = a text file format used by Microsoft products, such as Word and Office
.txt = a file extension for a text file
.xls = a file extension for a spreadsheet file format created by Microsoft for use with Microsoft Excel. XLS stands for eXceL Spreadsheet.
.pdf = a file format for capturing and sending electronic documents in exactly the intended format.