Ok im read the docu of plugin script. and create this files.
im have a GPL version
root@zod:/usr/share/webmin/virtualmin-wget# ls -al
total 36
drwxr-xr-x 4 root root 4096 2007-12-23 21:21 .
drwxr-xr-x 124 root root 8192 2007-12-23 20:26 …
d-wx–x--x 2 root root 4096 2007-12-23 20:45 help
d-wx–x--x 2 root root 4096 2007-12-23 20:45 lang
–wx–x--x 1 root root 42 2007-12-23 20:27 module.info
–wx–x--x 1 root root 104 2007-12-23 21:21 virtual_feature.pl
–wx–x--x 1 root root 137 2007-12-23 21:21 virtualmin-wget-lib.pl
virtual_feature.pl haves:
[code:1]
#!/usr/bin/perl
do ‘virtual-wget-lib.pl’;
sub feature_name
{
return "A description of your plugin";
}
[/code:1]
virtualmin-wget-lib.pl haves:
[code:1]#!/usr/bin/perl
do ‘…/web-lib.pl’;
&init_config();
do ‘…/ui-lib.pl’;
&foreign_require(“virtual-server”, "virtual-server-lib.pl"«»);
1;
[/code:1]
im delete the webmin cache 
When a i go to system settings>>features and plugins>>
im get the error:
Died at (eval 28) line 4.
Some suggest to fix it ? im wrong ?