TFS：
1. 打开Option -> Source Control -> Visual Studio TFS -> Configure User Tools;
2. 添加 .*, Compare, C:\Program Files (x86)\SourceGear\DiffMerge\DiffMerge.exe, /title1=%6 /title2=%7 %1 %2;
3. 添加 .*, Merge, C:\Program Files (x86)\SourceGear\DiffMerge\DiffMerge.exe, /title1=%6 /title2=%8 /title3=%7 /result=%4 %1 %3 %2;
GIT：
1. 打开Option -> Source Control -> Git Source Control Provider Options -> Configure User Tools;
2. 在External diff tool里指定： C:\Program Files (x86)\SourceGear\DiffMerge\DiffMerge.exe；
