diff -p -up docmgr/app/openoffice.php.return_code~ docmgr/app/openoffice.php
--- docmgr/app/openoffice.php.return_code~	2010-03-29 09:45:07.512801955 +0200
+++ docmgr/app/openoffice.php	2010-03-29 09:46:15.649800513 +0200
@@ -133,7 +133,15 @@ class OPENOFFICE {
 
       //convert the file to the new extension  
       $cmd = "php bin/fileconvert.php \"".$convfile."\" \"".$dest."\"";
-      `$cmd`;
+      $return_value = 0;
+      exec($cmd, $output = array(), $return_value);
+      if($return_value) {
+	$stdout = file_get_contents(TMP_DIR."/doc_conv.out");
+	$stderr=  file_get_contents(TMP_DIR."/doc_conv.err");
+	$this->throwError($stdout . " : " . $stderr);
+	return false;
+      }
+
 
       //if the file is html, we have to do some special stuff
       if ($newext=="html") $this->fixWebDoc($dest);