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 ...

How to open a .csv file in Excel Opening a .csv file is as easy as opening a .txt file, and usually, you won’t have to clean up the data before doing so because the save task inserts the delimiter.

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

For example, macros can extract data from a sheet, perform string operations on them and then output them to an external file. Excel usually opens macros using buttons, so you can arrange ...