While it’s not quite as easy as opening .docx files in Pages for Mac, it’s not an overly complicated process either. Here's how to open .xlsx spreadsheet files on Mac, iPhone or iPad.

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

PASADENA, USA: Open Files Inc.announces the release of XLSX Open File Tool, an advanced data recovery tool with a simple interface that is perfectly suitable for users of all skill levels. The UI ...

Has someone sent you a .numbers file that you can't open in Excel on your Windows PC? Here's how to edit it using Apple's iCloud apps ...

How to Open XLS Files on a Smartphone. XLS is the default file type for Microsoft Office Excel files. It is compatible with nearly all programs that read spreadsheet files. If you are looking to ...

Designed for use with Office 2000, XP, and 2003, the downloadable add-on allows you to open, edit, and save the newer file formats, seamlessly converting the files on the fly and in the background.