Block executable files rule does not work in Exchange 2013.

Hello all.

We have a task to block all executable files.

So I have created a rule:

New-TransportRule -Name ‘Rule 2 – Block Executable Content-Priority ‘0’ -Enabled $true -AttachmentHasExecutableContent $True -RejectMessageReasonText ‘Block Rule 2 – Sorry your mail was blocked because it contained executable content’ -StopRuleProcessing $true -SetAuditSeverity Low -SenderAddressLocation HeaderOrEnvelope

But, for example, *.jar files are not blocked.

I know that transport agent has its' own procedure for identifying executable content, but does anybody else have such problem?