If you are using attach file to response method to download internal table content to excel then it is not possible. Try to use ACF Up download UI element. Somewhere in the post by Sir Thomas jung i remember he explained silent file download using ACF Up download to the specific folder without prompting for user action to store the file.
It is not possible to download data in Excel sheet using Webdynpro ABAP. To make this possible, you have to use XML mapping.
For the XML mapping, create a dummy Excel Sheet with expected Cell formatting and save it as XML file. Use this XML tags in the method logic of Webdynpro ABAP coding.
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