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MCITP MCSE : Security Specialist OS Fundamentals part 1 Windows 9x IO.SYS The win 95 file IO.SYS, replaces both of the DOS IO.SYS and MSDOS.SYS files. This file contains the information needed to start the computer. You no longer need CONFIG.SYS and AUTOEXEC.BAT to start Windows, but these files are kept for some drivers and programs that use still them. The drivers loaded by default in win 9x IO.SYS include : HIMEM.SYS IFSHLP.SYS SETVER.EXE DBLSPACE.BIN or DRVSPACE.BIN Most of the entries that used to be in your CONFIG.SYS are now included in the win 9x IO.SYS IO.SYS does not load EMM386.EXE. If any application requires expanded memory , EMM386 must be loaded in CONFIG.SYS. To override default values in Windows 95 IO.SYS enter the value you want in your config.sys WIN.INI This used to contain user and program settings. The registry replaces the basic functions of the ini files used in earlier versions of Windows, the System.ini, WIN.INI, and Winfile.ini. Windows 9x keeps these files for backward compatibility with 16 bit applications that can not access the windows registry. User.dat Is one of three files that make up the windows registry. It is located in c:\windows directory , but if User Profiles are enabled then users may have there setting stored in c:\windows\profiles USER.DAT contains the following settings: Logon names Desktop settings Start menu settings The other two files that make up the registry are: System.dat Contains all the hardware configuration, Plug and Play settings, and application settings. It is located in c:\windows as a hidden file. Policy.pol May override any settings contained in the other two registry files. And can contain additional data specific to a network .You do not need Policy.pol to run windows. SYSEDIT System Configuration Editor , can be found in c:\windows\system. This program allows you to edit protocol.ini, System.ini, win.ini, config.sys, and your autoexec.bat files. SYSTEM.INI In win 3.1 hardware setting were found here. Most configuration options for Windows 9x are now stored in the Registry and are no longer required in SYSTEM.INI. but this file is retained for backwards compatibility. MSCONFIG (98) This is the System Configuration Utility located at c:\windows\system\msconfig.exe. This program lets you troubleshoot system configuration problems, by removing entries with check boxes, reducing the chance of typing errors which may happen if you use Notepad or the System Configuration Editor. It also allows you to create a backup of your system files before you change anything. It allows you to remove programs that are automatically started when windows starts. COMMAND.COM DOS file that contains the DOS command processor, receives and executes operating system commands REGEDIT.EXE Registry Editor is a tool for displaying and editing the registry database. It is located in c:\Windows directory . If you are running win 2000 you should use regedit32 instead. SYSTEM.DAT Contains all the hardware configuration, Plug and Play settings, and application settings. It is located in c:\windows as a hidden file. RUN COMMAND where you enter a command in the windows run box interpreted by windows not DOS COMMAND LINE PROMPT where you enter a command in DOS which is interpreted and executed by command.com i.e.: c:\copy