Duplicate files manager - Version 4.0 Duplicate files manager (DFM) is a tool help you find out duplicate files and expand disk space . You could find files with same content , same file name or same size . And compare two folders , find out same files between these two groups . DFM use some compare arithmethic to scan duplciate files , it could scan faster , or scan using less memory. After scan finish , I could generate a report of your files , let you know how much free space you could get from these duplicate files , and how much free space on each driver you could get . DFM could also save current settings and result as a job so that you could reopen the job and process it later .