The file attachment control allows you to specify accepted file types. Have you tried changing those?

I'm not sure if that will make a difference or not. Just a thought.

aI work for a company that uses a Voice Logging system that exports files as
*.au instead of wave files.  I've developed an Infopath form to score the
calls but would like to attach the sounds to the form.  However, I get an
error message:

For security reasons, the following type of attachment has been blocked: AU.

I have my internet options security turned all the way down but this still
doesn't work.  Any ideas?

Hi Nathan,

It seems as though we are following the security restrictions of Outlook in
this case. I am going to include some steps for modifying your registry
that should allow this; however, please note - we blocked these file types
for security reasons so you will need to be sure you want to open this
potential risk.

How to Customize Attachment Security Behavior

WARNING : If you use Registry Editor incorrectly, you may cause serious
problems that may require you to reinstall your operating system. Microsoft
cannot guarantee that you can solve problems that result from using
Registry Editor incorrectly. Use Registry Editor at your own risk.

You can modify the attachment security behavior in Outlook 2003 if you are
using Outlook in one of the following scenarios:

- You are not using Outlook in an Exchange environment.
- In an Exchange environment, the administrator has not configured the
Outlook Security settings to disallow changes to the attachment security
behavior.

In these scenarios, modify the attachment security behavior by making a
modification to the registry. To do so:

- Quit Outlook 2003, if it is running.
- Click Start , and then click Run .
- In the Open box, type regedit , and then click OK .
- See if the following registry key exists. If it does, skip to step 5.

HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security

- If the registry key does not exist, create it. To create the registry
key, locate and then click the following registry key:

HKEY_CURRENT_USER\Software\Microsoft

- Click the Edit menu, click New , and then click Key .
- Type Office , and then press ENTER.
- Click the Edit menu, click New , and then click Key .
- Type 11.0 , and then press ENTER.
- Click the Edit menu, click New , and then click Key .
- Type Outlook , and then press ENTER.
- Click the Edit menu, click New , and then click Key .
- Type Security , and then press ENTER.
- Click the Edit menu, click New , and then click String Value .
- Type the following name for the new value:

Level1Remove

- Press ENTER.
- Right-click the new string value name, and then click Modify .
- Type the extension of the file type that you want to open in Outlook
2003. For example: .au

** To specify multiple file types, use the following format:

.exe;.com

- Click OK .
- Quit Registry Editor.
- Restart your computer.

When you start Outlook 2003, you can open the file types that you specified
in the registry.

NOTE : Microsoft recommends that you enable only the file types that you
need. If you rarely receive a particular file type, Microsoft recommends
that you give Outlook 2003 temporary access to the file type in question,
and then reconfigure Outlook 2003 to block the file type by undoing the
changes to registry.

Again, I realize these are "Outlook" specific but once I made this change I
could successfully attach an ".au" file using the File Attachment control.

I hope this helps!

Scott L. Heim
Microsoft Developer Support

This posting is provided "AS IS" with no warranties, and confers no rights