How to Create an XLSX File

Create XLSX files in Excel 2007
1. Open Microsoft Excel 2007.
2. Click the round 'Office' button at the top-left corner of the Excel window and select 'New.' Choose your preferred document or template type and then click 'Create.'
3. Click the 'Office' button and select 'Save' when you are ready to save your spreadsheet data. Select the 'Save as type' drop-down menu, choose the top-most option labeled 'Excel Workbook' and then click 'Save.' Your document is saved in XLSX format.
Create XLSX files in Excel 2000, Excel XP or Excel 2003
4. Open a Web browser window and navigate to http://update.microsoft.com/. Install all high-priority updates before downloading the Microsoft Office Compatibility Pack.
5. Download the Microsoft Office Compatibility Pack from the Microsoft website. Double-click the installer file after it downloads to your computer and then follow the on-screen prompts to install the software.
6. Open Microsoft Excel 2000, Excel XP or Excel 2003.
7. Click 'File' in the top menu bar and select 'New.' Choose your preferred document or template type and then click 'OK.'
8. Click 'File' and select 'Save' when you are ready to save your spreadsheet data. Select the 'Save as type' drop-down menu, choose the option labeled 'Excel 2007 Workbook' and then click 'Save.' Your document is saved in XLSX format.