File Exterminator is basically a file shredding utility that will delete files and overwrite it multiple times to prevent file recovery. You can choose to shred multiple files across subdirectories or to shred a single file. File Exterminator is basically a file shredding utility that will delete files and overwrite it multiple times to prevent file recovery. You can choose to shred multiple files across subdirectories or to shred a single file. Besides that, you can specify the file mask (ex : *.txt) when you want to shred files across subdirectories. The number of shreds to perform can be customised as well.