When I use a DTS Send Mail task to send an email with a mail attachment (
"testfile.txt" ) to a non Outlook mail client it is appending the path to the
file name resulting in attachment names such as:

__File01_SharedFiles_Paul_testfile.txt

is there a way to prevent this from happening?

Actually it turns out that the receiving client doesn't matter. Even Outlook
still shows the altered filename.