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 ...

While there is a way for you to open two Excel workbooks at the same time, you can also open separate files in separate windows. In this article, we will be discussing 4 ways in which you can do so.

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