How to disable MIME sniffing (Error opening zip attachement within Application/x-zip-compressed file)

Try to open a mail from the web server provided by my ISP site and having an attachment shown as zip file. Cannot open it but an error occurred telling "the file is not a zip file or a downloaded file is corrupted,try to download again". Contacting the sender, he swear that is indeed a compressed file originated from an excel data base file. The "Help" tab from Internet Explorer recommend "to disable MIME sniffing" (what is this ?). Is something similar in Firefox, or other recommendation to open Application/x-zip-compressed file ? How to open such an attachment file in Firefox ? As a mention, I'm using Vista 32b , enough memory, I have installed WinZip software; any other zip files are opened correctly . Thanks Dan

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