<p>I just realised that after sending complete .CNM files as attachments, the content does not show in the preview pane of the attachment view but only the email headers are being displayed instead. In the column "Type" under "Multi-part section" it is declared as unknown. Looking at the raw data the attached file is encoded BASE64. When I sent the attachment I left file type and encoding to be default (Mailer decides). I would have expected that PM would display its own email file format as an email and display it in the 'usual' cascading way (as that CNM file may have an original message and replies etc)  but there might be a good reason for it that it doesn't ? [:)] What would be a sensible setting to for the "Content viewers" section to handle .CNM files? For the time being I have configured a text editor to open a CNM file in PM. Is there a smarter way maybe with a preview option? Thanks</p><p> Thomas </p>