Microsoft's spreadsheet program can do way more than you might realize. These are the hacks and tricks you need to know.

NanoXLSX is a small .NET library written in C#, to create and read Microsoft Excel files in the XLSX format (Microsoft Excel 2007 or newer) in an easy and native way - rabanti-github/NanoXLSX ...

How to compare two excel files for differences? Using this web tool, you can compare Excel document easily. Just select first/original file in left window and second/modified file in right window.