Commented Unassigned: AsyncFileUpload reports wrong ContentType in FireFox and Chrome [27634]

If I upload an excel file but name it "excel.jpg" for instance on upload complete the ContenType property will report 'image/jpeg' in Chrome and FireFox.

Internet Explorer reports 'application/x-zip-compressed'
Comments: It seems that this is an ASP.NET issue, not AsyncFileUpload.