.XLSX

.XLSX file extension

This is the basic program to work with .XLSX extension

docXConverter

docXConverter docXConverter Document

docXConverter 3.1 is a powerful but easy to use application that enables you to open and use files saved in Word 2007 format docx, in AppleWorks and ClarisWorks format cwk and in Excel 2007 format xlsx. It doesn't matter if the programs installed on your computer can open docx, cwk and xlsx files, the program will still manage to open and used the mentioned formats... (more)

The program works with the following extensions: docx, xlsx

.XLSX extension is also supported by the following programs:

Bytescout XLS Viewer

Bytescout XLS Viewer Bytescout XLS Viewer

View the contents of various types of spreadsheet files.
ThinkFree Office Calc

ThinkFree Office Calc

ThinkFree Calc is a new and innovative office tool.