I created this tool because I wanted to find a way to search my HDD for duplicate file names (designed first for MP3s). I then added the ability to check CRC32 so if the file is name completely different but the CRC is the same then it can detect those also. There are four modes to verify duplication, (1) Both files same file name length checks for common characters, (2) Both files different filename length (file 1 longer or shorter) check for common character groups, and (3) Check the file CRC32. I thought this was better because most file duplication checkers I have seen do not check for file name. This is important in MP3s because I could have TWO MP3s of the same song, but created by different people so they will have a different CRC32 but will have the same OR similar name.