I have some DTF and IDX files I would like to view. My computer is running windows vista and I have Microsoft office on the computer. When I click on one of the files I get a notification that Windows does not recognize this file type. So, I let windows search the web for a solution. There are some possible solutions shown such as downloading a program that will recognize the file. However, These programs talk about doing a lot of other things to my computer such as Registry and other things. I am reluctant to download and run these for fear it will create other problems with my system. What do I do?