We have a small number of citrix servers that all have office installed. Only a small subset of users have access to office. Everyone is set to open office documents with the free viewers on the Citrix servers. We control access to office through NTFS permissions. We now have a large number of users who need to be able to view office documents from a webpage. Opening office files normally works fine. When users open the office documents from the link in a webpage, it ignores the file associations and attempts to open the document with the full office program.

How can I change the program that IE uses to open office documents, or how can I force it to use the file associations I set in the operating system?