WEBUTIL_FILE.FILE_OPEN_DIALOG is not opening the directory which is passed as input ( after Oracle 1

Dear Team,

webutil_file.file_open_dialog is not opening the directory which is passed as input. Currently it is opening the window with default directory ( h:\my documents). Could you please help me out here?

Sample code below,

declare

l_default_dir varchar2(30) := 'H:\my data';

l_dir varchar2(100);

begin

l_dir := l_default_dir || '*';

webutil_file.file_open_dialog (l_dir, null,null, 'Select the file');

----next logic ........

end;