Index: lib/technoweenie/acts_as_attachment.rb
===================================================================
--- lib/technoweenie/acts_as_attachment.rb	(revision 1576)
+++ lib/technoweenie/acts_as_attachment.rb	(working copy)
@@ -369,7 +369,7 @@
             # TODO Convert to streaming storage to prevent excessive memory usage
             # FileUtils.copy_stream is very efficient in regards to copies
             # OR - get the tmp filename for large files and do FileUtils.cp ? *agile*
-            File.open(full_filename, "w") do |file|
+            File.open(full_filename, "wb") do |file|
               file.write(attachment_data)
             end
           end