diff --git a/xpcom/io/nsLocalFileWin.cpp b/xpcom/io/nsLocalFileWin.cpp
old mode 100644
new mode 100755
index 7e2a2a566e3c..db127eaf0a7a
--- a/xpcom/io/nsLocalFileWin.cpp
+++ b/xpcom/io/nsLocalFileWin.cpp
@@ -1205,7 +1205,7 @@ CleanupHandlerPath(nsString& aPath)
   aPath.Append(' ');
 
   // case insensitive
-  uint32_t index = aPath.Find(".exe ", true);
+  int32_t index = aPath.Find(".exe ", true);
   if (index == kNotFound)
     index = aPath.Find(".dll ", true);
   if (index == kNotFound)