Due to viruses Microsoft decided to block certain types of attachments,
better, decided to block certain filename extentions. This is a rather
clueless idea, because noone would ban blue cars, if one blue car
caused an accident... but its Microsoft.
The blocked extentions are common ones like .exe, .hlp or .cmd.
If you send mails with those filetypes as an attachment you get
a warning. And the receiver only sees the
(paper clip) but can't access the file.
Disruptor OL can grant access to the blocked files per item or auto-export
To protect the innocent, the 'secure' option allows to change the
extention to a double-click-save one.