Configure Visual Studio to use WinMerge Open Source Control > Visual Studio Team Foundation under the Tools > Options... menu in Visual Studio Click on Configure User Tools... Click Add.. and fill the information below to configure the Compare operation Extension: .* Operation: Compare Command: C:\Program Files\WinMerge\WinMergeU.exe Arguments: /x /e /ub /wl /dl %6 /dr %7 %1 %2 Click Add.. and fill the information below to configure the Merge operation Extension: .* Operation: Merge Command: C:\Program Files\WinMerge\WinMergeU.exe Arguments: /x /e /u /wl /dl %6 /dr %7 %1 %2 /o %4