diff -ru typo3_src-4.5.0.original/t3lib/utility/class.t3lib_utility_command.php typo3_src-4.5.0.new/t3lib/utility/class.t3lib_utility_command.php
--- typo3_src-4.5.0.original/t3lib/utility/class.t3lib_utility_command.php	2011-01-26 20:36:02.000000000 +0100
+++ typo3_src-4.5.0.new/t3lib/utility/class.t3lib_utility_command.php	2011-02-01 15:26:30.000000000 +0100
@@ -46,7 +46,14 @@
 	 * @return null|array
 	 */
 	public static function exec($command, &$output = NULL, &$returnValue = 0) {
+		if ($GLOBALS['TYPO3_CONF_VARS']['SYS']['UTF8filesystem']) {
+			$currentLocale = setlocale(LC_CTYPE, 0);
+			setlocale(LC_CTYPE, $GLOBALS['TYPO3_CONF_VARS']['SYS']['systemLocale']);
+		}
 		$lastLine = exec($command, $output, $returnValue);
+		if ($GLOBALS['TYPO3_CONF_VARS']['SYS']['UTF8filesystem']) {
+			setlocale(LC_CTYPE, $currentLocale);
+		}
 		return $lastLine;
 	}
 
@@ -68,6 +75,18 @@
 		}
 		$path = t3lib_div::fixWindowsFilePath($path);
 
+			// fix path containing whitespace (only if safe_mode is off)
+		if (!t3lib_utility_PhpOptions::isSafeModeEnabled()) {
+			if ($GLOBALS['TYPO3_CONF_VARS']['SYS']['UTF8filesystem']) {
+				$currentLocale = setlocale(LC_CTYPE, 0);
+				setlocale(LC_CTYPE, $GLOBALS['TYPO3_CONF_VARS']['SYS']['systemLocale']);
+			}
+			$path = escapeshellarg($path);
+			if ($GLOBALS['TYPO3_CONF_VARS']['SYS']['UTF8filesystem']) {
+				setlocale(LC_CTYPE, $currentLocale);
+			}
+		}
+
 		$im_version = strtolower($gfxConf['im_version_5']);
 		$combineScript = $gfxConf['im_combine_filename'] ? trim($gfxConf['im_combine_filename']) : 'combine';
 
@@ -78,12 +97,12 @@
 			// Compile the path & command
 		if ($im_version === 'gm') {
 			$switchCompositeParameters = TRUE;
-			$path = escapeshellarg($path . 'gm' . $isExt) . ' ' . $command;
+			$path = $path . 'gm' . $isExt . ' ' . $command;
 		} else {
 			if ($im_version === 'im6') {
 				$switchCompositeParameters = TRUE;
 			}
-			$path = escapeshellarg($path . (($command == 'composite') ? $combineScript : $command) . $isExt);
+			$path = $path . (($command == 'composite') ? $combineScript : $command) . $isExt;
 		}
 
 			// strip profile information for thumbnails and reduce their size