Sometimes the best way to fix a problem is to avoid it altogether. Indeed, Cache::FastMmap is not to be found on Windows Perl's, so don't use that.

I found this on the Catalyst maillist archives. Switch out the use of one Cache::Cache module for another that works on Windows, in this case Cache::FileCache. Here is the change to Catalyst::Plugin::Authentication::FastMmap in patch form:

--- FastMmap.pm-0.12    2005-05-25 17:33:18.000000000 -0500
+++ FastMmap.pm 2005-07-21 20:15:07.527036800 -0500
@@ -3,7 +3,8 @@
 use strict;
 use base qw/Class::Data::Inheritable Class::Accessor::Fast/;
 use NEXT;
-use Cache::FastMmap;
+#use Cache::FastMmap;
+use Cache::FileCache;
 use Digest::MD5;
 use URI;
 use URI::Find;
@@ -124,9 +125,12 @@
     $self->config->{session}->{rewrite} ||= 0;

     $self->_session(
-        Cache::FastMmap->new(
+      # Cache::FastMmap->new(
+        Cache::FileCache->new(
+         {
             share_file  => $self->config->{session}->{storage},
             expire_time => $self->config->{session}->{expires}
+         }
         )
     );
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