0:38   How To Change Excel File Extension xls, xlsx, xlsm, xlsb, xps, pdf 6:46   Understanding File Types (.xls, .xlsx, .xlsm, .csv, .txt) in Microsoft Excel 1:14   How To Change Excel File Extension xls, xlsx, xlsm, xlsb, xps, pdf 4:24   Excel file types CSV vs XLSX vs XLSM 0:52   How To Change Excel File Extension xls, xlsx, xlsm, xlsb, xps, pdf - 2026✅ 1:57   What is difference between xls and xlsx files of Excel?? 2:29   How do i fix file format or file extension is not valid in excel 7:38   Open A Password Protect Excel File with 3 Methods (No Software & 100% Free) 1:08   How to find all the excel files on your windows computer 7:58   Microsoft Excel - File Formats: Differences, Pros, and Cons 1:40   How to Change the Format on a Excel Document From XLSX to XLS 5:23   1-7: Understand Common Excel file formats (XLSX, XLSM, XLSB, XLS, PDF) 2:47   Why Excel File Types Matter: A Quick Guide 1:40   Excel cannot open the file '.xlsx' because the file format or file extension is not valid - ⚠️SOLVED 4:31   Excel Challenge | Convert Old Excel File XLS to New Excel File XLSX | Macro | Excel Sifu 0:45   How to convert google sheets to excel without losing formatting 4:00   Excel for Beginners - Save, Save As & Saving Different File Types 0:29   How to Save Excel File as a CSV File 3:23   How to Convert CSV to Excel (Simple and Quick) 1:10   How to convert old Excel files into newer xlsx in Excel 2019