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.
Home > Search converters: _xls to xlsx
Conversion of _xls file format to xlsx file format beta
Search for _xls to xlsx converter or software able to handle these file types.
Convert Microsoft Excel workbook to Microsoft Excel Open XML workbook and spreadsheet.
We have found 2 software records in our database eligible for ._xls to .xlsx file format conversion.
Microsoft Windows software 
- convert _xls to xlsx on Windows
Microsoft Excel
A popular spreadsheet application distributed with Microsoft Office suite
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from _xls file | Yes, Microsoft Excel supports _xls file conversion as a source file type. | Yes | Yes | _xls editor | Yes | No | No | No |
to xlsx file | 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
Microsoft Excel for Mac
A popular spreadsheet application from the Microsoft Office suite
Additional links: Open _xls file, Open xlsx file
_XLS
Files with _xls extension are mostly worksbooks or their renamed backups from Microsoft Excel spreadsheet editor distributed as a part of Microsoft Office suite.
XLSX
Files with xlsx extension are s used by Microsoft Excel for its workbooks (spreadsheets) in Office Open XML format. XLSX is the latest spreadsheet format used by Excel with the adoption of XML formatting first used in Office 2007. While older xls files were in proprietary binary file format, xlsx spreadsheets use a somewhat altered XML scheme.
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