Hi Tony, this is by default:
this is the workaround
Expand the branches to HKEY_CURRENT_USER\ Software\ Microsoft\ Office\ 10.0\ Outlook\ Security
Create a new string value by selecting New and then String Value from the Edit menu.
Name the new value Level1Remove.
Double-click the new Level1Remove to edit it, and enter the filename extensions you'd like to stop Outlook from blocking. Extensions should be typed in lower case, without the dots (.), and separated by semicolons (
. For example, type
exe;mdb;vbs
to allow .exe, .mdb, and .vbs attachments, respectfully.
Click Ok and then close the Registry Editor when you're done. You may have to restart Outlook for this change to take effect.