The default installation location varies depending on which version of Office you are using. The Excel executable file can be found inside Microsoft Office installation folder. Search for Excel executable file inside its installation folder in your computer.
If you cannot find an Excel shortcut in your Desktop, create a shortcut in your Desktop by following the steps below. Search for Excel application shortcut icon inside your Windows Desktop and Doubleclick it to open Excel. How to open Excel in Windows 10 using Desktop shortcut