系统软件是指控制和协调计算机及外部设备,支持应用软件开发和运行的系统，是无需用户干预的各种程序的集合，主要功能是调度，监控和维护计算机系统；负责管理计算机系统中各种独立的硬件，使得它们可以协调工作。系统软件使得计算机使用者和其他软件将计算机当作一个整体而不需要顾及到底层每个硬件是如何工作的。
FileScavenger是能够恢复在NTFS格式下意外删除的文件工具，前提条件是所删除的硬盘尚未被改写新的文件上去才可以救回，提供了找寻文件类型功能，如*.doc及*.txt，能够救回的文件不只单一文件，还包括整个目录及压缩文件，也支持救回来的文件选择在原来所在位置恢复或储存到其它的硬盘。
keygen.exe会被误报，请信任，运行软件，获得request码生成注册码
File Scavenger? Version 4 is a file "undelete" and data recovery utility for Windows? 8, 7, Vista, Server 2003, XP and 2000. File Scavenger? can recover files that have been accidentally deleted (including files removed from the Recycle Bin, in a DOS window, from a network drive, from Windows Explorer with the SHIFT key held down) provided that recovery is attempted before the files are permanently overwritten by new data. File Scavenger? supports both basic and dynamic disks, NTFS comdivssion, alternate data streams, sparse files, Unicode filenames, etc. Except in severe cases, both the file and the folder path leading to the file can be recovered.
系统软件一般是在计算机系统购买时随机携带的，也可以根据需要另行安装。