PAGE('EXPORTFILE' ...)

PAGE('EXPORTFILE', 
Record,
string Fieldname,
string Filename,
string FileType ['file', 'image']);

Example:
PAGE('EXPORTFILE', Item, 'Picture', 'image.jpg', 'image');

For Android and Windows devices an export to file system is performed. On iOS devices a compatible app is opened. This is similar to the behaivior in the command.