Vistanita Twin2Die is tool to find duplicated files. It uses byte-to-byte comparison so the duplicated files is exactly have same content.Vistanita Twin2Die support large file over 2GB. Here's the feature of Twin2Die :

1. Fast locate duplicated files in your media.
2. Support large file over 2GB.
3. Uses byte-to-byte comparison.
4.Uses multithreading on large file (>1 MB), make it fast for both small and large file and the thread number is customizable.
5.Simple and easy to use user interface
6.Create and customize your own extension menu.
7.Save, load and syncronize the result.
8.Stable and uses small resources.
9.'File Skipping' feature.
10.Integrated image previewer, support various image format such as jpeg(*.jpg;*.jpeg;*.jpe),gif(*.gif),png(*.png),bmp(*.bmp),ico(*.ico)..and more
11.Customizable preferences.
12.Save and shutdown PC feature.