Here's a good set of conditions that will filter attachments for you:
From the dropdown box, select "If the Body text" then 'contains' and enter the following conditions, adding "OR" between each:
name=.{1,64}\.scr
name=.{1,64}\.pif
name=.{1,64}\.exe
name=.{1,64}\.zip
name=.{1,64}\.bat
name=.{1,64}\.com
name=.{1,64}\.vbs
name=.{1,64}\.shs
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This will effectively keep the above extensions out of your mailbox, and it's worth your time to set this up for your entire domain using the root account. If you're concerned about losing vital emails, then use the custom autoresponse I just began discussing in the Spam section.
As always, please let me know if you have any questions.