Bing found the following results
XLS File (What It Is & How to Open One) - Lifewire
Open Excel Online for Free - Aspose
4 Ways to Open Excel Files - wikiHow
6 Ways to Open XLS and XLSX Files for Free - MUO
Work in Excel for the web - Microsoft Support
How to Open an XLS File Step by Step - Learn Excel
Microsoft Excel Viewer: How to Download, Install, and Use
XLS File - What is an .xls file and how do I open it? - FileInfo.com
How to Open Old Excel Files (XLS) in Excel & Google Sheets
.XLS Files - What They Are and How to View and Open One | Adobe