How to programmatically upgrade .XLD to .XLXS
 

I'm importing a large number of Excel 2003 files into a SharePoint document
library. I'v written a utility to do this. If possible I'd also like to
upgrade them from .XLS to .XLSX.

Does anyone know how to use the Excel API to do this? Thank you very much

How to programmatically upgrade .XLD to .XLXS
 

I would think that you have to save the .xls in a system that will accept is
as .xlxs
or, if it contains macros, .xlxm and then do the import.

"Nate" wrote:

I'm importing a large number of Excel 2003 files into a SharePoint document
library. I'v written a utility to do this. If possible I'd also like to
upgrade them from .XLS to .XLSX.

Does anyone know how to use the Excel API to do this? Thank you very much

How to programmatically upgrade .XLD to .XLXS
 

I'd really like to do it in C# programmatically. I know an .XLS file can be
opened in Excel 2007 and saved in the .XLSX format but I have a few thousand
files to work with and that's a lot of work!