in your httpd.conf for the server or Vhost you are configuring for. The exe file will need a shebang line such as #!/usr/bin/perl to indicate what interpretter or shell to use unless it is compiled binary capable of being executed on Linux of course and the file will need to be chmod 755.
I am not familiar with the PAR module or what you mean by packaged Perl scripts. If it is a Windows executable or self-extracting archive, it is highly doubtful that it will run on Linux.
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