use native functions of php to parse the string into the Var

core/js/js.js

@@ -53,7 +53,7 @@ OC={
 		var isCore=OC.coreApps.indexOf(app)!=-1;
 		var link=OC.webroot;
 		if(file.substring(file.length-3) == 'php' && !isCore){
-			link+='/?app=' + app + '&getfile=' + type + '/' + file;
+			link+='/?app=' + app + '&getfile=' + encodeURI(type + '/' + file);
 		}else{
 			link+='/';
 			app+='/';

lib/base.php

@@ -284,7 +284,7 @@ class OC{
 		if(file_exists(OC::$APPSROOT . '/apps/' . OC::$REQUESTEDAPP . '/' . OC::$REQUESTEDFILE)){
 			require_once(OC::$APPSROOT . '/apps/' . OC::$REQUESTEDAPP . '/' . OC::$REQUESTEDFILE);
 		}else{
-			header('404 Not found');
+			echo "WTF";
 		}
 	}
 
@@ -401,12 +401,11 @@ class OC{
 		self::$REQUESTEDAPP = (isset($_GET['app'])?strip_tags($_GET['app']):'files');
 		self::$REQUESTEDFILE = $_GET['getfile'];
 		if(substr_count(self::$REQUESTEDFILE, '?') != 0){
-			$pos_questionmark = strpos(self::$REQUESTEDFILE, '?');
-			$pos_equal = strpos(self::$REQUESTEDFILE, '=');
-			$pos_and = strpos(self::$REQUESTEDFILE, '?');
-			$_GET[substr(self::$REQUESTEDFILE, $pos_questionmark + 1, $pos_equal - $pos_questionmark - 1)] = substr(self::$REQUESTEDFILE, $pos_equal + 1, $pos_and);
-			self::$REQUESTEDFILE = substr(self::$REQUESTEDFILE, 0, $pos_questionmark);
-			$_GET['getfile'] = OC::$REQUESTEDFILE;
+			$file = substr(self::$REQUESTEDFILE, 0, strpos(self::$REQUESTEDFILE, '?'));
+			$param = substr(self::$REQUESTEDFILE, strpos(self::$REQUESTEDFILE, '?') + 1);
+			parse_str($param, $_GET);
+			self::$REQUESTEDFILE = $file;
+			$_GET['getfile'] = $file;
 		}
 		self::$REQUESTEDFILE = (isset($_GET['getfile'])?(OC_Helper::issubdirectory(OC::$APPSROOT . '/' . self::$REQUESTEDAPP . '/' . self::$REQUESTEDFILE, OC::$APPSROOT . '/' . self::$REQUESTEDAPP)?self::$REQUESTEDFILE:null):null);
 	}

lib/helper.php

@@ -45,7 +45,7 @@ class OC_Helper {
 					$app = substr($app, 0, strlen($app) - 1);
 				}
 				$urlLinkTo =  OC::$APPSWEBROOT . '/?app=' . $app;
-				$urlLinkTo .= ($file!='index.php')?'&getfile=' . $file:'';
+				$urlLinkTo .= ($file!='index.php')?'&getfile=' . urlencode($file):'';
 			}
 			else{
 				$urlLinkTo =  OC::$WEBROOT . '/' . $app . $file;