You can simply re-save (File → Save as..) opened XLSX spreadsheets as a XLSMHTML variant in Microsoft Excel. This will create a HTML based version of the XLSX spreadsheet.
Convert Microsoft Excel Open XML workbook and spreadsheet to Microsoft Excel MIME HTML spreadsheet.
We found 2 software records in the database related to .xlsx to .xlsmhtml file format conversion.
Microsoft Windows software - convert xlsx to xlsmhtml on Windows
A popular spreadsheet application distributed with Microsoft Office suite
Convert from xlsx file format
|Yes, Microsoft Excel supports xlsx file conversion as a source 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 xlsx to xlsmhtml. 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 xlsx to xlsmhtml on OS X
A popular spreadsheet application from the Microsoft Office suite