What is a _XLSX File Type?
You can rename an XLSX file by changing the word.... xlsx" l' extension to .xxx". After renaming, you can open the XLSX file with a variety of programs, such as Microsoft Excel, FreeOffice Calc and Apple Numbers.
XLSX files can be created by e-mail programs, especially Windows Live Mail when sending XLSX files by e-mail. Windows Live Mail can rename files if the name of the file ends in a quot quot quot quot quot quot quot quot quot quot in the appos extension. For example, the sample xlsx is changed to a sample xlsx by the e-mail program. It also happens frequently with .DOC, .DOCX and .XLS files.
Most XLSX files are created by Microsoft Excel. However, they can be created at the help of another spreadsheet, such as LibreOffice Calc or Apple Numbers.