/fileloggerparameters[n]: Provides any extra parameters for file loggers. The presence of this switch implies the corresponding ...

/fileloggerparameters[n]:                                
                     Provides any extra parameters for file loggers.
                     The presence of this switch implies the 
                     corresponding /filelogger[n] switch.
                     "n" if present can be a digit from 1-9.
                     /fileloggerparameters is also used by any distributed
                     file logger, see description of /distributedFileLogger.
                     (Short form: /flp[n])
                     The same parameters listed for the console logger are
                     available. Some additional available parameters are:
                        LogFile--path to the log file into which the
                            build log will be written.
                        Append--determines if the build log will be appended
                            to or overwrite the log file. Setting the
                            switch appends the build log to the log file;
                            Not setting the switch overwrites the 
                            contents of an existing log file. 
                            The default is not to append to the log file.
                        Encoding--specifies the encoding for the file, 
                            for example, UTF-8, Unicode, or ASCII
                     Default verbosity is Detailed.
                     Examples:
                       /fileLoggerParameters:LogFile=MyLog.log;Append;
                                           Verbosity=diagnostic;Encoding=UTF-8

                       /flp:Summary;Verbosity=minimal;LogFile=msbuild.sum 
                       /flp1:warningsonly;logfile=msbuild.wrn 
                       /flp2:errorsonly;logfile=msbuild.err