I'm creating a plugin where a file is loaded and if a link is clicked, it passes some variables that are appended to the url. So if a link is clicked it will change the url by appending filter/?term=il_Massac,st_locked which should load the filter.php file.

My issue is how do I get it to use the filter.php which is included in the plugin? The main plugin file is called meta-box.php. If I added it the the theme as a page, it works but I want the plugin to do the work instead of adding a page. Right now, if I don't use it as a page-template in the theme folder and just have it in the plugin folder, it gives a 404.

I hope I was clear enough.

Any suggestions on how I might do this?