Index: libraries/libraries.module
===================================================================
--- libraries/libraries.module	(revision 12054)
+++ libraries/libraries.module	(working copy)
@@ -133,7 +133,7 @@
   $files = array();
   foreach ($directories as $dir) {
     if (file_exists($dir)) {
-      $files = array_merge($files, file_scan_directory($dir, '@^[a-z0-9._-]+\.libraries\.info$@', array(
+      $files = array_merge($files, file_scan_directory($dir, '@^[A-Za-z0-9._-]+\.libraries\.info$@', array(
         'key' => 'name',
         'recurse' => FALSE,
       )));