I don't know if is this that you are talking about...
in httpd.conf
# This should be changed to whatever you set DocumentRoot to.
#
LoadModule perl_module modules/mod_perl.so
#<Directory "C:/indigoperl/apache/htdocs">
<Directory "C:...public_html/www_root">
#
# Possible values for the Options directive are "None", "All",
# or any combination of:
# Indexes Includes FollowSymLinks SymLinksifOwnerMatch
ExecCGI MultiViews
#
# Note that "MultiViews" must be named *explicitly* ---
"Options All"
# doesn't give it to you.
#
# The Options directive is both complicated and important.
Please see
# http://httpd.apache.org/docs-2.0/mod/core.html#options
# for more information.
#
#ISEXT
# Options Indexes FollowSymLinks
Options Indexes FollowSymLinks MultiViews ExecCGI
+Includes
#ISEXT BEGIN
# BEGIN MOD_PERL CONFIG
PerlSendHeader On
<Files "*.pl">
SetHandler perl-script
PerlHandler ModPerl::Registry
Options ExecCGI
</Files>
# END MOD_PERL CONFIG
#
# AllowOverride controls what directives may be placed in .htaccess files.
# It can be "All", "None", or any combination of the keywords:
# Options FileInfo AuthConfig Limit
#
AllowOverride None
#
# Controls who can get stuff from this server.
#
Order allow,deny
Allow from all
</Directory>
and the only thing that i find about *.shtml is ...
#
# For type maps (negotiated resources):
# (This is enabled by default to allow the Apache "It Worked" page
# to be distributed in multiple languages.)
#
AddHandler type-map var

#
# Filters allow you to process content before it is sent to the client.
#
# To parse .shtml files for server-side includes (SSI):
# (You will also need to add "Includes" to the "Options" directive.)
#
#AddType text/html .shtml
#AddOutputFilter INCLUDES .shtml
#ISEXT
AddType text/html .shtml
AddHandler server-parsed .shtml

#
# Action lets you define media types that will execute a script whenever
# a matching file is called. This eliminates the need for repeated URL
# pathnames for oft-used CGI file processors.
# Format: Action media/type /cgi-script/location
# Format: Action handler-name /cgi-script/location
#
I hope that can help you... help me :)