Which of the following is not a valid Excel file format?

a) .xlsx

b) .csv

c) .docx

d) .xlsm

Show Answer

Answer: c) .docx

.docx is not a valid Excel file format; it is a file format used by Microsoft Word for word processing documents. Excel primarily uses formats like .xlsx for regular workbooks and .xlsm for workbooks containing macros. .csv, on the other hand, is a common text-based file format used for data interchange and can be opened in Excel as well.