Microsoft Excel is the industry leading spreadsheet application and data analysis tool. Explore free spreadsheet software tools with advanced features in Excel.

Lists the file formats that are supported in Excel. The topic also includes a list of unsupported file formats and some suggested workarounds.

Open Excel XLS, XLSX, and CSV spreadsheet files with this simple app. XLS Opener lets you view, print, and share any spreadsheet. XLS Opener is built for simplicity and speed. Quickly open any …

Feb 14, 2019 · The Excel Binary File Format (.xls) is a collection of records and structures that specify workbook content, which can include unstructured or semi-structured tables of numbers, text, or both …

Aug 19, 2025 · Specifies the Excel Binary File Format (.xls) Structure, which is the binary file format used by Microsoft Excel 97, Microsoft Excel 2000, Microsoft Excel 2002, and Microsoft Office Excel …

Excel makes it easy to crunch numbers. With Excel, you can streamline data entry with AutoFill. Then, get chart recommendations based on your data, and create them with one click. Or easily spot trends …

Save your workbook to another file format that can be opened in the other program. For example, save to an XML spreadsheet or text file format that the other program might support as well.

With Microsoft 365 for the web you can edit and share Word, Excel, PowerPoint, and OneNote files on your devices using a web browser.

Having trouble opening a file? It’s probably because it's been saved in a file format that this version of Excel doesn’t support. Check the table to see if that’s the case.

You can reduce your file size by saving your spreadsheet as a binary workbook (.xslb) instead of the default format (.xslx). The default format is XML based, which is important if you're using your data …