A file with the XLSX file extension is a Microsoft Excel Open XML Format Spreadsheet file. It's a ZIP-compressed, XML-based spreadsheet file created by Microsoft Excel version 2007 and later.

How to Open Excel 2007 Files As Separate Windows. ... or via the "Open" menu in Excel, the files will run simultaneously in one Excel window.

XLS files are Excel workbook files created in Excel 97 or Excel 2003. The 2007, 2010 and 2013 versions of the program use the XLSX format by default to save workbooks, but can also use the XLS format.

If your XLSX file isn’t opening in Excel, you might not have Excel 2007 or a later version, which is needed for XLSX compatibility. Ensure your Microsoft Excel is updated.

Of course, it’s incredibly easy to edit .xlsx files on your Mac using Microsoft Excel for Mac – open the software, select the Browse tab on the left-hand side of the pop-up window that appears ...

To begin, create or open the spreadsheet in Numbers and click on File > Export to > Excel. Next, you can select the file format you want. Choose .xlsx for the newer version of Microsoft Office ...

You can open the file in Excel, or you can import the data using an Excel wizard. The two most common text file formats you’ll work with are .txt and .csv, where .csv stands for comma separated ...

How to import Microsoft Excel spreadsheets into Apple Numbers. This procedure works with .xlsx and .xls file formats. You can also import .csv and tab-delimited files.