How can I use the folder firewall blocker?

To use the folder firewall blocker -

  **Configure and Add rules in windows firewall based on dynamic content (exe files) in that folder: **

you should work with PowerShell or command line tools that run everyday.

like this : Article Link

function Add-FirewallRule {
   param( 
      $name,
      $tcpPorts,
      $appName = $null,
      $serviceName = $null
   )
    $fw = New-Object -ComObject hnetcfg.fwpolicy2 
    $rule = New-Object -ComObject HNetCfg.FWRule
    $rule.Name = $name
    if ($appName -ne $null) { $rule.ApplicationName = $appName }
    if ($serviceName -ne $null) { $rule.serviceName = $serviceName }
    $rule.Protocol = 6 #NET_FW_IP_PROTOCOL_TCP
    $rule.LocalPorts = $tcpPorts
    $rule.Enabled = $true
    $rule.Grouping = "@firewallapi.dll,-23255"
    $rule.Profiles = 7 # all
    $rule.Action = 1 # NET_FW_ACTION_ALLOW
    $rule.EdgeTraversal = $false
    $fw.Rules.Add($rule)
}
# Sample Usage
Add-FirewallRule "Test port 1234" "1234" $null $null
Add-FirewallRule "Test port 5555-6666" "5555-6666" $null $null
Add-FirewallRule "Test port 2222 Calc" 2222 "c:windowssystem32calc.exe" $null
Add-FirewallRule "Test port 3333 W3SVC" 3333 $null "W3SVC"
There are also some good VBScript samples on MSDN which I used as a starting point.

BUT recommended that you add a firewall or proxy on the edge of your network, like ISA or SQUID for all of your inbound traffic in your LAN.

open ISA Server Management, click Start, point to All Programs, point to Microsoft ISA Server, and then click ISA Server Management.  Block responses containing Windows executable content visit this Article here

To block responses containing Windows executable content

 1. In the console tree of ISA Server Management, click Firewall Policy.

 2. In the details pane, click the applicable access rule or Web   publishing rule.

 3. On the Tasks tab, click Edit Selected Rule.

 4. On the Traffic tab (for Web publishing rules) or on the Protocols

        tab (for access rules), click Filtering, and then click Configure
        HTTP.

 5. On the General tab, click Block responses containing Windows 

executable content.

  in our network that based on windows we have cache server named SQUID quid content filtering: Block / download of music MP3, mpg, mpeg, exec files

First open squid.conf file /etc/squid/squid.conf:
vi /etc/squid/squid.conf
Now add following lines to your squid ACL section:
acl block files urlpath_regex "/etc/squid/blocks.files.acl"
You want display custom error message when a file is blocked:
Deny all blocked extension
deny_info ERR_BLOCKED_FILES blockfiles
http_access deny blockfile