To reduce the size of the file is compressed ZIP. If you save your Excel workbook, it usually got the .xlsx ending. Let us know if that works for you. Open the Excel File. "Excel cannot open the file 'filename.xlsx' because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file." I have succeeded in opening and saving a file with the .xls extension, but saving with the .xlsx extension does not work. But there's no such document (at least I didn't find anything close to it). Rename it: Replace the .xlsx ending of the file name by .zip. Click Enter once done. XLSX is available since Excel 2007 and replaces the old XLS file type. Right-click on the Excel File. That means, your file is an Excel file which will open in Excel. It usually indicates the file is not compatible with the Excel version or the file has come corrupt or damaged. Go to the View Tab. – cesss Dec 29 '17 at 0:14 There is a trick: Save your workbook and close it. To repair a .xlsx file with this feature; Open MS Excel and Go to “File” Menu. This new file format is part of Microsoft's Open XML format, which results in a smaller file size and better data integration with external sources. The XLSX file format was introduced as a replacement of XLS file type with the launch of Excel 2007. It writes the .xlsx file, but when I try to open it I get the following error: Excel cannot open the file 'SomeFile.xlsx' because the file format is not valid. Based on structure organized according to the Open Packaging Conventions as outlined in Part 2 of the OOXML standard ECMA-376, the new format is a zip package that contains a number of XML files. Cannot store Microsoft Visual Basic for Applications (VBA) macro code […]. The extension .xls denotes that the file is a Microsoft Excel file. This is a file extension for a spreadsheet file format..xls files can also be opened and edited by the Microsoft Excel Viewer, and OpenOffice. I tried "Stellar Repair for Excel " to scan my corrupted excel file. XLSX is a file format created with Microsoft Excel, version from 2007 and younger. So you basically just replace the .xlsx by .zip. Unzip it. Most of the time you use the XLSX format: It’s save (can’t store malicious code), has the maximum number of rows and columns and is best known. All data distributed document and stored in the cells. A fairly complete description of the XLSX format could be written in 10 pages or so (at least containing all the fields and values for the 95% of XLSX files out there). With the launch of Office 2007, Microsoft changed the default file extension to .xlsx. Rename ".XLSX" to ".XLS". Go to the folder where you Excel file is stored. After enabling the “File Name Extension,” you can change the extension of any file. Using “Open and Repair” Feature of MS ExcelThe “Open and Repair” feature of Excel allows you to repair the corrupted excel files. XLS and XLSX extensions represent popular Excel file formats that were introduced by Microsoft as part of its Office suite over a period of time. Select Rename. Verify that the file has not been corrupted and that the file extension matches the format of the file." .xls stands for eXceL Spreadsheet. Open File Explorer. XLSX file format is based on the Open XML. This file is a spreadsheet. XLSX is well-known format for Microsoft Excel documents that was introduced by Microsoft with the release of Microsoft Office 2007. "Excel cannot open the file 'filename.xlsx' because the file format for the file extension is not valid. Microsoft Excel worksheet sheet (97–2003) The .xls format is native to Microsoft Excel. 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