When setting up mongod.exe to run as a service on Windows by specifying the --install command line switch, the --dbpath and --logpath options are correctly quoted when reinserted into the command line that gets set up to be run by the Windows Service Controller. --config, --pidfilepath and perhaps others need the same quoting treatment, otherwise paths and filenames that contain spaces will mess up the parsing of the command line, leading to mongod services that don't start or don't start correctly.
User's command line:
Resulting command line:
Without quotes (reinserted) around C:\My mongo folder\pidfile , this is not going to work.