As was said that is a client side operation. Your best bet in a perfect world is convert the files to Acrobat PDF and allow users to access them that way - OR - use the save as webpage feature in XLS and DOC to convert these items to webpages prior to linking. You could also pop an alert up and mark a business rule of "don't save off documents to work on".

This is a common issue in most workplaces. The vast corporate world moves to document management tools to handle this but for your purposes Acrobat or Web conversion would probably work fine.

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"promote the general welfare, not provide the general welfare"

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.