New Warning when compiling

[holygrailfx]

'F' - unrecognized character escape sequence $$$$$$$$5april.mq4 10887 46

which is part of the following sequence

	//-- ftp errors
	case 4260: e = "FTP server is not specified"; break;
	case 4261: e = "FTP login is not specified"; break;
	case 4262: e = "FTP connection failed"; break;
	case 4263: e = "FTP connection closed"; break;
	case 4264: e = "FTP path not found on server"; break;
	case 4265: e = "File not found in the MQL4\Files directory to send on FTP server"; break;
	case 4266: e = "Common error during FTP data transmission"; break;

I guess that it should be MQL4/Files

Cheers