Apache Windows (CGI):
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Put file parser3.exe to cgi-bin folder of your web-site.

Create in root folder of your site file .htaccess and add these commands to it: 

# assign parser as .html pages handler:
AddHandler parsed-html html
Action parsed-html /cgi-bin/parser3.exe

# disable access to .cfg and .p files:
<Files ~ "\.(p|cfg)$">
Order allow,deny
Deny from all
</Files>

Note: default Apache server configration does not allow to use .htaccess files.