If your XLS file has data that you need in an open, structured format, the Mr. Data Converter online tool is a great option, converting XLS or CSV directly to XML, JSON, or a number of other similar formats.
XLS files are Excel workbook files created in Excel 97 or Excel 2003. The 2007, 2010 and 2013 versions of the program use the XLSX format by default to save workbooks, but can also use the XLS format.
There are differences in the XLSX and XLS formats created by Excel. While XLS files use a proprietary binary format, XLSX files use a newer file format referred to as Open XML. The XLS extension is used by Microsoft Excel 2003 and earlier and the XLSX extension is used by Microsoft Excel 2007 and later.
This document contains a description of the binary file format of Microsoft Excel, including all available Excel versions (for Windows) from Excel 2.x to the current Excel 2003. This project has been started in June 2001 and is still in progress.
Why can't I open my Excel file? Having trouble opening a file? It’s probably because it has been saved in a file format that this version of Excel doesn’t support. Find your device and then check the table to see if that’s the case.
Microsoft Excel 97 to 2003 workbook file definition and 3 other types and linked programs information. File extension xls is used by following type(s): Type 1 description: Default extension for .xls type: Microsoft Excel 97 to 2003 workbook This suffix is related to Microsoft Excel and its spreadsheet documents.
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In the case that your XLS file doesn't open, it is highly likely that you do not have the correct software application installed on your PC to view or edit XLS file extensions. If your PC opens the XLS file, but it's the wrong application, you'll need to change your Windows registry file association settings.
The xls file extension is associated with Microsoft Excel, one of the most popular and powerful tool you can use to create format spreadsheets, ... like open xls file, edit xls file, convert xls file, view xls file, play xls file etc. (if exist software for corresponding action in File-Extensions.org's database).
Excel Cannot Open the File/the File Format or File Extinction Is Not Valid. Sometimes, when you are editing an Excel file on Microsoft Office 2007, 2010, 2013 or 2016, it suddenly refuses to open and shows the following error: "Excel cannot open the file 'filename.xlsx' because the file format or file extension is not valid.