[Plugin: Filter Pages by parent in admin] Two PluginPages

Hi there

I’m testing your plugin
in the plugin folder there are two files, with different file-names,

filter-by-parent-in-admin.php and
filter-pages-by-parent-in-admin.php

but with absolut the same code => why?

http://ww.wp.xz.cn/extend/plugins/filter-pages-by-parent-in-admin/