File formats that are supported in Excel - Microsoft Support
Lists the file formats that are supported in Excel. The topic also includes a list of unsupported file formats and some suggested workarounds.
XLS vs. XLSX Files - What's the Difference? - Spreadsheet Planet
Learn the key differences between XLS and XLSX file formats in Excel, including compatibility, file size, security, and features.
XLS File - What is an .xls file and how do I open it? - FileInfo.com
Jun 14, 2023 · An XLS file is a spreadsheet file created by Microsoft Excel or exported by another spreadsheet program, such as OpenOffice Calc or Apple Numbers. It contains one or more …
All About Excel Files (Types, Extensions, Open, Merge, Etc. )
Jul 9, 2024 · Excel supports 3 file formats. Their names, extensions, and details are in separate lists below. The Excel 2010 and Excel 2007 default XML-based file format. Stores Excel 4.0 …
.XLS Files - What They Are and How to View and Open One | Adobe
XLS were the original Excel files. Learn all about them - including how to view and open them - and get the lowdown on their replacement with Adobe.
Excel: What Is the Native File Format for Excel?
Jun 17, 2025 · XLS is the older binary format used before Excel 2007 and supports up to 65,536 rows. XLSX, introduced in Excel 2007, is XML-based, supports over 1 million rows, and …
What Is an XLS File? And How to Use It? - Layer
In this guide, we will explore the XLS file format, how to create and edit XLS files, share and organize them, and troubleshoot any issues that may arise. What Is an XLS File? An XLS file …
XLS File: How to open XLS file (and what it is)
Jan 22, 2025 · We have identified five XLS openers that are compatible with this specific type of XLS file. While Microsoft Excel spreadsheet is a popular type of XLS-file, we know of 2 …
How to Check Excel File Extension (2 Easy Methods)
Dec 9, 2025 · Learn how to check an Excel file extension using File Explorer or directly within Excel to quickly identify formats like XLS, XLSX, and more.
XLS File (What It Is & How to Open One) - Lifewire
Apr 7, 2023 · Open one with Excel or Google Sheets. Convert to XLSX, CSV, PDF, and others with those same programs. This article describes XLS files, including how to open one and …