i'm bored, so here is some basic untested code:
<?php
$pagetoread = $_GET['page'];
unset($_GET['page']);
$f = fopen($pagetoread, "rb");
$contents = fread($f, filesize($pagetoread));
fclose($f);
echo $contents;
?>
next steps would include passing parameters, parsing the file so you can also let it load images via the server, etc.