I hope this helps someone. I have solved my problem -  a couple of hours taken 
however!

The following command will create PDFs on both platforms (as shown by the most 
recent language reference)
These are readable and printable
SET PRINT OPTION(Destination option;2;$longDocName)

However I only get valid PDFs for EMAIL using the older code for MAC
SET PRINT OPTION(Destination option;3;$longDocName)

I feel SO in need of a good set of printed reference documents for use when 
things are changing quite rapidly and now that V18 has come out v17v6 docs are 
not available on line.
I suspect this is a version difference.

Kind regards and thank you for all the suggestions

Steve

On 03/04/2020, 18:25, "4D_Tech on behalf of UKVetDerm via 4D_Tech" 
<[email protected] on behalf of [email protected]> wrote:

    
    The files won't open on Mac OS or Windows and the applications tried 
include Preview, PDF Expert and Adobe Acrobat
    
    The header information looks good to me
    %!PS-Adobe-3.0
    %APL_DSC_Encoding: UTF8
    %APLProducer: (Version 10.14.6 (Build 18G4032) Quartz PS Context)
    
    Thanks
    
    Steve
    
    On 03/04/2020, 18:15, "4D_Tech on behalf of JBellos via 4D_Tech" 
<[email protected] on behalf of [email protected]> wrote:
    
        More along the lines of Tim - we had a problem recently where there was 
some
        'stuff' being inserted into the header of the PDF. Mac Preview seems to 
do a
        great job at ignoring this, but most Windows based PDF readers don't
        (including Acrobat), probably for security reasons. If you save the 
received
        PDF to disk and examine it in some kind of raw text editor, do you see
        garbage before the PDF or does it look OK?
        
        
        
        --
        Sent from: http://4d.1045681.n5.nabble.com/4D-Tech-f1376241.html
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