Ampersand (&) in xml-file

I have made an XML-file using the write-command because I need to format it in a way not possible with an XML-port. Some Company names have ampersands (&) in them. Since that sign it not allowed in an XML-file I replace them with '&'. But when the file is created the '&' is back. I've checked that the replacement went fine with
IF CONFIRM(CompanyName) THEN;

It seems as Navision interpret '&' as '&'. Is there any way to force the sign to '&' ?

Thanks in advance.