Excel to SpreadsheetML and vice versa

I have written a program to produce data in SpreadsheetML format. MS Excel can open it fine.

I am looking into using Aspose.Cells to take SpreadsheetML and save it as Excel2003. However, when I tried it, all hyperlinks in the document disappeared. I even created an Excel with hyperlinks using Aspose.Cells and save it as SpreadsheetML, but the document didn't contain any reference to the hyperlinks. Is Aspose.Cells fully compatible with SpreadsheetML format or just partially implemented? I would like to know if/when it's fully implemented if not currently. Thanks.

Hyperlinks are not supported in Excel2SpredsheetML and SpreadsheetML2Excel conversion. We will add it in the future release. Could you tell me your expected date for this feature?