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All versions of Studio can open Excel files, but as you are using an old retired version of the product perhaps your issue is that the Excel files you received are based on a more modern version of the file? Please post this into the technical forums.

How can I translate Excel Workbooks in Trados Studio 2011? I cannot seem to add the files.

I use Studio 2011, and need to translate several Excel Workbook files. But, when I want to add the files to a Project, these are not accepted. How can work with them? Do I need to update to Studio 2017? If I did, would I be able to add the Excel  Workbook files?