What is the best way to insert massive data into an existing excel file?

dear gurus,
i am wondering that what is the best way to insert massive data into an existing excel file, more performance perspective.
the file is read from BDS , and we want to insert data into it .
the way i can think of is
1. OLE AUTOMATION
   i think performance will be a big problem
2. Office integration
    i am not sure it's facing the same performance issue ?
3 . XXL_SIMPLE_API/FULL_API
    I am not sure whether they can insert data into an existing excel file?
could you please give me some advices?
br.
jun

Hi,
If you want to APPEND data( add data to an existing excel file) from SAP, then use GUI_DOWNLOAD fm with APPEND = 'X' paramter.
Best regards,
Prashant

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