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This article is from the Spreadsheets FAQ, by Russell Schulz casfaq@locutus.ofB.ORG with numerous contributions by others.

10.19 What is the correct, registered MIME Content-Type for Excel files?

application/vnd.ms-excel

see http://www.isi.edu/in-notes/iana/assignments/media-types/application/vnd.ms-excel

so don't use any of these:
application/ms-excel
application/msexcel
application/excel
application/x-ms-excel
application/x-msexcel
application/x-excel
application/octet-stream

 

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business, spreadsheets, Excel, Quattro, Lotus 1-2-3, free, open source, commercial, tab delimited, csv, formula, macro