found it! problem already solved :)
 
http://bugs.otrs.org/show_bug.cgi?id=4073


From: otrs-bounces@otrs.org [mailto:otrs-bounces@otrs.org] On Behalf Of Glossop, Andrew
Sent: 26 August 2009 16:43
To: User questions and discussions about OTRS.
Subject: [otrs] 2.4.3: forwarding a ticket -> attachments are lost

Is this is known issue? If I forward a ticket, the attachment isn't forwarded too. Seems OK with .jpg, but .msi or .dll is missing. Is this a bug, some attachment types restricted, or a problem specific to my installation? Any ideas? I thought I read about this recently, but having done a search I can't find any info.
 
 
 
Kind Regards,
 
Andrew Glossop