How to Open Multiple CSV Files in One Excel Spreadsheet. The CSV file extension appears on text documents that contain comma-separated values. Like spreadsheet data, each line in a CSV file ...

Let’s get started. 1] Open XML file in MS Excel It may sound strange, but MS Excel can handle XML data. It allows you to open XML documents and view or edit their content.

Though DAT files, which house data as the shortened name implies, are usually best left alone, here's how you can open them.