How can I import .xlsb files? Robert Orzanna (Sheetgo) September 07, 2017 06:44 Updated Follow We don't support .xlsb files yet. Please see Supported File Types. If this article did not answer your question, please leave a comment below. To return to Sheetgo, click here. New to Sheetgo? Get started! Comments 0 comments Please sign in to leave a comment.