IE files downloading as .fdf instead of .pdf

I have a user where I work that is downloading insurance quotes from an IE browser. When downloading a home insurance quote, the file is attempting to download as a .fdf file instead of a .pdf. He doesn't have the same issue with the auto quotes. I have put in a ticket with the insurance web site, but wanted to see if I could get any ideas on the issue through here since these files should be opening in Acrobat 9 but can't due to the file type.

I know that .fdf files are used on a server application but this is a workstation. He's the only one in the department having the issue but it's not associated just with his profile on the PC. It's a Win7 64-bit OS. Any ideas?