diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index aad2c5bec..556b9551f 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -247,7 +247,7 @@ module ApplicationHelper
     
     if attachments
       attachments = attachments.sort_by(&:created_on).reverse
-      text = text.gsub(/!((\<|\=|\>)?(\([^\)]+\))?(\[[^\]]+\])?(\{[^\}]+\})?)(\S+\.(gif|jpg|jpeg|png))!/) do |m|
+      text = text.gsub(/!((\<|\=|\>)?(\([^\)]+\))?(\[[^\]]+\])?(\{[^\}]+\})?)(\S+\.(bmp|gif|jpg|jpeg|png))!/i) do |m|
         style = $1
         filename = $6
         rf = Regexp.new(Regexp.escape(filename),  Regexp::IGNORECASE)
diff --git a/test/unit/helpers/application_helper_test.rb b/test/unit/helpers/application_helper_test.rb
index 6e1356bee..cbf5a54bc 100644
--- a/test/unit/helpers/application_helper_test.rb
+++ b/test/unit/helpers/application_helper_test.rb
@@ -24,7 +24,8 @@ class ApplicationHelperTest < HelperTestCase
                       :repositories, :changesets, 
                       :trackers, :issue_statuses, :issues, :versions, :documents,
                       :wikis, :wiki_pages, :wiki_contents,
-                      :boards, :messages
+                      :boards, :messages,
+                      :attachments
 
   def setup
     super
@@ -70,6 +71,15 @@ class ApplicationHelperTest < HelperTestCase
     to_test.each { |text, result| assert_equal "<p>#{result}</p>", textilizable(text) }
   end
   
+  def test_attached_images
+    to_test = {
+      'Inline image: !logo.gif!' => 'Inline image: <img src="/attachments/download/3" title="This is a logo" alt="This is a logo" />',
+      'Inline image: !logo.GIF!' => 'Inline image: <img src="/attachments/download/3" title="This is a logo" alt="This is a logo" />'
+    }
+    attachments = Attachment.find(:all)
+    to_test.each { |text, result| assert_equal "<p>#{result}</p>", textilizable(text, :attachments => attachments) }
+  end
+  
   def test_textile_external_links
     to_test = {
       'This is a "link":http://foo.bar' => 'This is a <a href="http://foo.bar" class="external">link</a>',