Possible Duplicate:
Team Foundation Server (TFS) File Difference viewer – customize with other tool
I’m using Visual Studio 2010 Ultimate with TFS. I don’t like the default diff program of TFS.
Is it possible to change default diff program to something else, like WinMerge?
You can use just about any 3rd party merge tool with TFS. Here is a Blog with comprehensive instructions on calling out to most of the major diff / merge tools.