I need to convert some xls files into xlsx files. I can successfully convert one xls file into xlsx by running this command into cmd prompt (windows):
ssconv
you can run something like this (paste the code bellow in a .bat, or if you want it to run interractively replace the %% by % :
for %%i in (c:\directory\*.xls) do ssconvert %%i %%i.xlsx
If you can run powershell it will be :
Get-ChildItem -Path c:\directory -filter *.xls | foreach {ssconvert $($_.FullName) $($_.baseName).xlsx }