Are you clicking a download link from an email message on an OWA or webmail site? Do you get the open/save dialog for the .snp files? In that case, you should be able to associate them with the Snapshot viewer. If Firefox does not remember this and you have to do it each time, it usually indicates that the server is not sending a specific content type, just the generic "this is some binary content" content type.

Thanks for the answer. However as I said, I don't have any problem opening them using IE7/8. With portable Firefox, no problem with MS Office 2003 but with MS Office 2007, Firefox does not recognize .snp files and would not allow me to open/save! I'm just wondering if this current version of FF is compatible with MS Office 2007? Thanks again.

I haven't heard of any other problems with Office 2007 vs. 2003, but most people don't have the Pro/Enterprise versions with Access, so maybe there is a previously unnoticed problem there.

As noted in my earlier post, I still don't understand how you are trying to access the file. Can you right-click and "Save Link As" to download it?

Thanks for you assistance. Now I realized that using MS Office 2007 pro plus, I have to save the file first before I can open it. It is not the case using MS Office Pro 2003, meaning that I can either open and/or save the files without any hassle!