Index: typo3/mod/tools/em/class.em_index.php
===================================================================
--- typo3/mod/tools/em/class.em_index.php	(Revision 6519)
+++ typo3/mod/tools/em/class.em_index.php	(Arbeitskopie)
@@ -4555,6 +4555,7 @@
 
 		$flag_M = 0;
 		$flag_B = 0;
+		$flag_Dispatch = 0;
 
 		foreach($lines as $k => $l)	{
 			$line = trim($l);
@@ -4566,16 +4567,29 @@
 			}
 
 			unset($reg);
-			if (preg_match('/^\$BACK_PATH[[:space:]]*=[[:space:]]*["\']([[:alnum:]_\/\.]+)["\'][[:space:]]*;/',$line,$reg))	{
-				$lines[$k] = str_replace($reg[0], '$BACK_PATH=\''.$this->typeBackPaths[$type].'\';', $lines[$k]);
-				$flag_B = $k+1;
+			if (preg_match('/^\$BACK_PATH[[:space:]]*=[[:space:]]*["\']([[:alnum:]_\/\.]+)["\'][[:space:]]*;/', $line, $reg)) {
+				$lines[$k] = str_replace($reg[0], '$BACK_PATH=\'' . $this->typeBackPaths[$type] . '\';', $lines[$k]);
+				$flag_B = $k + 1;
 			}
+
+				// Check if this module uses new API (see http://bugs.typo3.org/view.php?id=5278)
+				// where TYPO3_MOD_PATH and BACK_PATH are not required
+			unset($reg);
+			if (preg_match('/^\$MCONF\[["\']script["\']\][[:space:]]*=[[:space:]]*["\']_DISPATCH["\'][[:space:]]*;/', $line, $reg)) {
+				$flag_Dispatch = $k+1;
+			}
+
 		}
 
 		if ($flag_B && $flag_M)	{
 			t3lib_div::writeFile($confFilePath,implode(chr(10),$lines));
 			return sprintf($GLOBALS['LANG']->getLL('writeModPath_ok'),
 				substr($confFilePath, strlen(PATH_site)));
+		} elseif ($flag_Dispatch){
+			return sprintf(
+				$GLOBALS['LANG']->getLL('writeModPath_notRequired'),
+				substr($confFilePath, strlen(PATH_site))
+			);
 		} else return $GLOBALS["TBE_TEMPLATE"]->rfw(
 			sprintf($GLOBALS['LANG']->getLL('writeModPath_error'),
 			$confFilePath)
Index: typo3/sysext/lang/locallang_mod_tools_em.xml
===================================================================
--- typo3/sysext/lang/locallang_mod_tools_em.xml	(Revision 6519)
+++ typo3/sysext/lang/locallang_mod_tools_em.xml	(Arbeitskopie)
@@ -427,6 +427,7 @@
 			<label index="clearMakeExtDir_could_not_create_dir">ERROR: Could not create extension directory "%s"!</label>
 			<label index="clearMakeExtDir_no_dir">ERROR: The extension install path "%s" was no directory!</label>
 			<label index="writeModPath_ok">TYPO3_MOD_PATH and $BACK_PATH were updated in "%s"!</label>
+			<label index="writeModPath_notRequired">Notice: Module "%s" uses module-API to register module, TYPO3_MOD_PATH and $BACK_PATH not required.</label>
 			<label index="writeModPath_error">Error: Either TYPO3_MOD_PATH or $BACK_PATH was not found in the "%s" file. You must manually configure that!</label>
 			<label index="updateLocalEM_CONF_ok">The file "%s" was updated with a cleaned up EM_CONF array.</label>
 			<label index="updateLocalEM_CONF_not_writable">Error: "%s" was not writable!</label>