As you probably already figured it out from its name, this tool is meant to allow you to open XLSX files. XLSX files are now widely used by Excel users, as it has been introduced in 2007 by MS Office as the new standard format for workbooks and spreadsheet files.
Using this small tool you can open and view the contents of XLSX files even on system where you cannot install MS Excel. XLSX Viewer is very simple, small, neat and lightweight, so it can be quickly installed on any system and used with ease by any kind of users, including complete beginners. Best of all, it's also free. It displays some ads to other products by the same developer, but that's a small price to pay considering that this handy tool offers a really convenient solution to view the contents of XLSX files.
This handy tool can also open XLS, RTF, and TXT files, besides the aforementioned XLSX format. Furthermore, it can print the opened spreadsheets or send them by email. Last but not least, a neat and useful search function is included. As you can see, though simple and lightweight, it still offers some nice additional features.
To sum it all up, if you ever need to open and view Excel files and you cannot use Excel for whatever reason, then you can resort to using this little tool and you'll have no regrets as long as only checking or printing the contents of the Excel files is all that you wanted to do.