How to open a CSV file in Microsoft Excel. 1. In Excel's ribbon, click the File tab and then click Open.. 2. Click Browse and, in the File Explorer box, click the drop-down menu to the right of ...

If the DAT file you're trying to open is text, you can convert the file into text in the Microsoft Excel program by first saving it as a CSV file. Right-click the DAT file on your PC and click "Open." ...

There are multiple ways to convert a CSV file to Excel formats (XLS, XLSX). You can use Microsoft Excel, a dedicated converter freeware, or an online tool to perform the conversion.