DoubleKiller is a free and easy to use application that uses a finest comparison criterion for finding and removing exact duplicate files. It will searches single or multiple directories for duplicate files by comparing any combination of file name, size, modification date and content, which you can easily configure.
Here is a simple method to eliminate duplicate files using DoubleKiller. Download (392Kb zip), unzip and run the program (no installation required). Click on ‘Option’ tab and click on + sign under ‘folders’ box to add a directory for searching (you can add multiple folders or a partition itself).
Now enter a file extension (for example *.mp3, *.avi, *.mp*g) under ‘Limit scan to files matching these masks’ box to find its duplicate and click on + sign to add. Now click on ‘Run’ tab to find duplicates.
The files from a duplicate set will appear in different shading. This will help you eliminate them without mixing them up with the main file. There are several other options to choose for advanced users. More details are available from the included help file.