If you click on a link to a .doc on an ordinary Web site using IE6 you get a
dialog box asking if you want to open, Save or Cancel. Clicking Open displays
the document in a sort of Word browser.

Do the same thing from a Sharepoint site and you get a dialog box warning
that some remote files may be dangerous but clicking OK opens the document in
Word and lets you edit the original file in it's original location.

Try openning a .rtf document from within Sharepoint and you get the same
action as from an ordinary web site as in the top paragraph.

How can I change things to force Word to open .rtf and other files from
within Sharepoint, the same way that it does for .docs?