If you are getting the Data source reference is not valid while trying to create a pivot table in Microsoft Excel, see this post for the fix.

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 ...

There is a "Print" option in the context menu in Windows, you don't need to open a document in the program with the file association first. This works with documents, but obviously not in file ...

In most cases, if you find yourself unable to open a particular file type on a PC, it's because you do not have the program that runs that type of file.