[vs.net] Diff Tool for local files
In the tools directory of Visual Studio (C:\Program Files (X86)\Microsoft Visual Studio 11.0 (or 12.0)\Common\IDE\ you find the tool VsDiffMerge.exe
Tip: You can also use %VS110COMNTOOLS% on the commandline to point to this directory.
When you start VSDiffMerge, the diff / merge tool starts up with two files that you choose.
%VS110COMNTOOLS% one dir back, enter to IDE, execute : vsdiffmerge.exe "File1" "File2"
vsdiff.cmd – so, now drag&drop two files from explorer to vsdiff.cmd
"%VS110COMNTOOLS%/../IDE/vsdiffmerge.exe" "%1" "%2"