However a converter is available from Microsoft to convert MS Office Open XML file format to the previous MS Office version file format. But if you don’t have the converter and want to view the MS Word or Excel 2007 file urgently then you can use Gmail.
Compose a new mail and attach the docx or xslx file which you want to view. Send it to yourself or some other email. Go to the sent folder and open the mail which you just have sent and scroll down to the attachment. Click on the “View as HTML” to view the document.