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.

By design, Apple uses its own Numbers (.numbers) file format, while Excel uses the XLSX file format, or for earlier spreadsheets, the XLS format. You can open XLSX files in Numbers, but you can ...

Click Upload File. If it’s dimmed, call your administrator. Locate the demonstration .xlsx file on OneDrive, select it and click Open. Lists will upload the data to the OneDrive library.

In comparison, an XLSX file is a regular Excel spreadsheet that doesn't contain this type of code and doesn't require any special steps to open the file and start working.

The example files used here can be downloaded by clicking the file name: example1.txt, example1.csv, example1.xlsx. (For text format files, you can copy the content on the webpage and paste it into a ...