.pl in order for them to work with ModPerl.
Also, there are serious security issues with TWikiRelease02Sep2004 - please see TWikiSecurity and update to TWikiRelease04Sep2004, even if you are on an intranet.
By the way, Perl 5.8.0 is a very old version that you may want to upgrade if you run into problems. As long as your locale environment setting does not include .utf8 at the end, you should be OK, but see IssuesWithPerl5dot8 if you have any issues with this.
-- RichardDonkin - 13 Oct 2005
So that I did not have to rename files, I added the following to my VirtualHost defninition:
<Directory ~ /bin/>
SetHandler perl-script
PerlInitHandler Apache::StatINC
PerlHandler Apache::Registry
Options ExecCGI
</Directory>
-- MichaelGrant - 13 Mar 2006