Convert XLS to XLSX
With FileStar you can easily convert XLS to XLSX. Accessible directly in your right click menu for single or batch XLS processing. How to convert XLS to XLSX:
1. Download and install the latest version of FileStar. (https://filestar.com)
2. Right click on one or more XLS file(s) on your desktop and select Convert with FileStar.
Type "convert xlsx" in the search box.
3. Press Run.