* .Xlsx format appears from Microsoft Office Excel 2007 version and above, and Excel 2003 version uses * .xls format. Perhaps you are familiar with this file format, right?
However, if your computer is using the Office 2003 suite, it cannot be opened * .xlsx format. So how to open this format? Do not worry! You only need to download and install Microsoft Office 2007 office suite or above to read .xlsx format freely:
These office suites, in addition to opening * .xlsx format, can easily open in docx, pptx format ... So download Microsoft Office 2007 and above to open both * .xls and * formats .xlsx will you do?