You might be able to open _XLS files using latest Microsoft Excel and save it in XLSM format.
Convert Microsoft Excel workbook to Microsoft Excel Open XML macro-enabled workbook.
We found 2 software records in the database related to ._xls to .xlsm file format conversion.
Microsoft Windows software - convert _xls to xlsm 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 xlsm file conversion as a target file type.||Yes||Yes||xlsm 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 xlsm. 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 xlsm on OS X
A popular spreadsheet application from the Microsoft Office suite