This warning dialog box appears when you are using Source Server. It indicates that the command the debugger needs to execute to obtain source code is not in the list of trusted commands for Source Server contained in the srcsvr.ini file. If this is a valid command, you can add it to the srcsvr.ini file. Otherwise, you should not run it. For more information, see Specify Symbol (.pdb) and Source Files in the Visual Studio Debugger.