You receive a file named project4.xlsx as an attachment to an email message. what do you expect the file to contain?

The file will contain excel spreadsheets.

Explanation:

If you receive an .xlsx file it means that this is a file extension, more specifically of excel format.

We must remember that before the year 2007, the excel files only had the extension .xls, so this file will be a later version that year.

What will contain this file are spreadsheets, which are useful for creating formulas, arithmetic operations, formatting tables, columns, etc.

To open this file you must have Microsoft Excel installed.

so much for the extra points :

continuous information you receive.