In Notes 10.0.1 returned option “View” when double click attachment.
You can prevent dialog box from appearing by enabling the local notes.ini parameter AttachmentActionDefault=1. With this parameter enabled, double clicking on an attachment icon will simply open the file without a dialog box first displaying. This parameter may also be set via a Desktop policy.
The setting options for this notes.ini parameter include:
AttachmentActionDefault=1 Defaults to “Open”
AttachmentActionDefault=2 Defaults to “Edit”
AttachmentActionDefault=3 Defaults to “View”
AttachmentActionDefault=4 Defaults to “Save…”