Why does Outlook damage pdf files when sending as attachment?

Outlook Express on Windows XP

When sending a pdf file as an attachment, the recipient gets this error
message: There was an error opening this document. The file is damaged and
could not be repaired. The same files when sent as an attachment from a
different application (hotmail e.g.) open properly so it appears that Outlook
is the culprit.
I found this generating PDF's from crystal reports.
The file is being truncated. I have found that this happens if the PDF is
below a certain size (around 10k but it depends). Essentially if the PDF is
a single page and only has a single section compressed with /FLATE, outlook
will truncate it.

In article <605546B1-B46A-45E9-ADB7-182C948E9988@microsoft.com>,
=?Utf-8?B?TXVraHRhcg==?= wrote:
> Outlook Express on Windows XP
>
Outlook Express is not the same software package as Outlook. This is a
newsgroup for Outlook, not Outlook Express.

--
Hollis Paul
Mukilteo, WA USA