You can do that, but it sounded like the display of the dropped item was not what you wished for (that is handled by the MS rich edit control and isn't something we can change).
To prevent Excel spreadsheets that are imported as documented (into the tree) from displaying in UR, remove .xls, .xlsx, and .zip from 'Tools | Options | Browser | File extensions to display in internal browser view' and/or add .xls;.xlsx to 'Tools | Options | Documents | File extensions to edit/view externally'.
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