You don't necessarily need Microsoft Excel to work with an .xlsx file Reviewed by Ryan Perian This article explains what XLSX files are, how to open them, and which programs are able to convert ...

If your Excel files are opening in Notepad on Windows PC, here's how you can reset the settings to make .xls, .xlsx, etc files open in Excel.

You can make Excel always open old spreadsheets in Protected View. Enable or disable Protected View using in-built setting, Group Policy, Registry.

How to edit .xlsx files on Mac So, how do you edit an .xlsx file on a Mac? Due to the open file format used by Microsoft’s Excel software, it’s surprisingly easy to edit a .xlsx file on a Mac.

Numbers has the ability to open Excel files so you can work on them. You can also export spreadsheets in Numbers so that they are compatible with Excel.

Also, if you're using multiple versions of Excel on the same computer, the default program for opening your files may be a different version of Excel than you'd prefer to use.

If you spend a large part of your day dealing with boring, TPS-like reports, you've probably noticed that Excel 2007 won't let you put spreadsheets side-by-side on your multi-monitor desktop ...