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Supported excel/ppt formats


As follows from the api all operation for creating and formatting of workbook/presentation are the same/transparent for all formats. The specific format can be specified in workbook.save or presentation.save.

Is there any issues concerning differences between formats, especially 97-2003 (default) and xlsx formats?
ppt and pptx formats?


There is no issue when you use Workbook.Save method to save different Excel formats, see the document on how you can save different file formats:
Regarding PowerPoint formats, please ask Aspose.Slides team in their related forum, they will help you soon.

Thank you.