D:\>grep IO::Handle D:\perl\lib\pod\perl*del*
D:\perl\lib\pod\perl5004delta.pod:File handles are now stored internally as type IO::Handle.  The
D:\perl\lib\pod\perl5004delta.pod:IO::Handle, IO::Seekable, and IO::File.  We suggest, but do not
D:\perl\lib\pod\perl5004delta.pod:    IO/Handle.pm         IO::Handle extension Perl module
D:\perl\lib\pod\perl5004delta.pod:     IO::Handle

D:\>corelist IO::Handle

IO::Handle was first released with perl 5.00307