Some email clients rename XLS files to _XLS. Simply rename them back to XLS, open in Microsoft Excel and resave them in XLSX format using the File → Save as.. function in the program.
Convert Microsoft Excel workbook to Microsoft Excel Open XML workbook and spreadsheet.
We found 2 software records in the database related to ._xls to .xlsx file format conversion.
Microsoft Windows software - convert _xls to xlsx on Windows
A popular spreadsheet application distributed with Microsoft Office suite
Convert from _xls file format
|Yes, Microsoft Excel supports _xls file conversion as a source file type.||Yes||Yes||_xls editor||Yes||No||No||No|
|Yes, Microsoft Excel supports xlsx file conversion as a target file type.||Yes||Yes||xlsx editor||Yes||No||No||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned _xls to xlsx. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert _xls to xlsx on OS X
A popular spreadsheet application from the Microsoft Office suite