The .xlsx and .docx are new extensions which need Microsoft Office 2007 to access and are not compatible with any older Microsoft Office suite. However, there are many free applications like NW Docx Converter, Microsoft Office 2007 compatibility add-on and online converter with these tools we can easily access and edit Office 2007 format files.

Now there is one more easy solution. Google Docs has included support for excel extension.xslx and doc extension .docx. So now there is no need of Microsoft office 2007, compatible add-on or any free applications.

Just, log into Google Docs, select .xlsx or .docx format files from your computer or enter direct URL and click on “Upload” button. Google docs will automatically convert .xlsx to .xls format and .docx to .doc format. You can easily edit it online and then save the files back to your computer in .doc or .xls format.

The great benefit of Google Docs is you don’t have to worry about what format the file is in. Just upload files and Google Docs will automatically detect the format.