In bug #618360: Error recognizing XLS file type quicksketch diagnosed a problem for me and suggested I submit an excel file with a request for supporting XLS in Mimedetect to meet my needs for Filefield uploading. Please find the attached XLS file. Would any other information be helpful?

CommentFileSizeAuthor
null.xls.zip5.55 KBflickerfly
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manuel.adan
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Issue summary: View changes
Status: Active » Closed (outdated)

Closing this as outdated, feel free to re-open if you're still looking for a solution and waiting for appropriate assistance.