Require()

I want to use require to send some post information to a page. Code: if ($viewsystem = = 1) $Str = "editexemptfiles.php?every = 1"; require($Str); I've tried what it says in the online documentation, but it doesn't work, Tried: $Str = "d:\htdocs\somewhere\editexemptfiles.php?every = 1"; getting the following error: Fatal error: Failed opening required 'd:/htdocs/somewhere/anotherpage.php?every = 1' (include_path='.;d:\php\includes') in d:\htdocs\somewhere\thispage.php on line 48