If you do not have Excel on your computer but you want to open CSV files on your PC, you can use CSVFileView. It is freeware, which helps you open CSV files without Excel, Google Sheets, or any ...

If you've encountered a CSV file and you're unsure what they're for, the good news is they're pretty straightforward and easy-to-use with apps you already know.

You can open .DAT files that contain text, with text editors, like Notepad, Notepad++, VS Code, etc. But it is not possible to know what contains in a DAT file.