compare 2 files with Visual Studio

// open cmd
<<<path to Visual Studio\Common7\IDE>>>devenv /diff file1 file2

Or just create a batch file. Example:

@echo off
echo Drag and drop the first file onto this window. Then press [ENTER]
set /p file1=
echo Drag and drop the second file onto this window. Then press [ENTER]
set /p file2=
"C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\devenv.exe" /diff %file1% %file2%