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.

While there is a way for you to open two Excel workbooks at the same time, you can also open multiple spreadsheets in separate windows. Learn how!

In this guide, we'll show you the different ways to reduce the size of a Microsoft Excel spreadsheet to make it easier to share and store.