To use the mother of all compare tools "Beyond Compare" as your default code comparer in Visual Studio 2010, you need to follow the next steps:
1. Install BC3 (Download the trial and buy it if you like at http://www.scootersoftware.com)
2. Go to the options followed by Source Control, Visual Studio Team Foundation Server and click on Configure User Tools.
3. Click on Add and add a Compare command for extension .* using command C:\Program Files (x86)\Beyond Compare 3\BComp.exe and arguments %1 %2 /title1=%6 /title2=%7
4. Click on Add and add a Merge command for extension .* using command C:\Program Files (x86)\Beyond Compare 3\BComp.exe and arguments %1 %2 /savetarget=%4 /title1=%6 /title2=%7
- or -
if you want BC Pro's 3-way merge: %1 %2 %3 %4 /title1=%6 /title2=%7 /title3=%8 /title4=%9
You need to use the bcomp.exe, else it wound work see http://www.scootersoftware.com/vbulletin/showthread.php?t=5538
Cheers,
L