The Rise and Fall of Autoexec.bat. Back in the days of MS-DOS and Windows 3.1 (yes – the caveman days, when we fought dinosaurs and 640K of RAM was a lot), every time your computer started up, it looked for and executed a batch script called “autoexec.bat”. Autoexec.bat file. The autoexec.bat file was an MS-DOS feature. Under Windows there is a still a degree of backwards compatibility - if the file (C: autoexec.bat) exists, any SET statements within it will be parsed at boot time. The 32-bit version of Windows 10 can run a 16-bit application. When you execute legacy application into Windows 10, Windows prompted to add NTVDM, the NT virtual DOS machine. Autoexec.bat file. The autoexec.bat file was an MS-DOS feature. Under Windows there is a still a degree of backwards compatibility - if the file (C:autoexec.bat) exists, any SET statements within it will be parsed at boot time.
After command.com loads and initializes, it is configured to look for andprocess autoexec.bat. autoexec.bat is a batch file. Batch files simplystore a list of commands that are executed in order, and autoexec.bat isconfigured to be executed at boot. In addition to executing programs,autoexec.bat is used to set environment variables and load TSRs(Terminate Stay Resident programs).
autoexec.bat is used to set environment variables, such as the location ofthe temporary directory and the search path. Windows 9x will enforce certainvariables and settings prior to executing autoexec.bat, which allowsyou to change, append, or replace any of these values. The default values forthe Windows 9x autoexec.bat are listed in Table below. Since the temporarydirectory is set to the Windows directory, many people change at least thisone path to point to a different location, so that temporary files do not fillthe Windows directory. If you want to add to the default system path, youcan do so with a statement such as:
SET PATH = %PATH%;C:MYAPPS;
This will add to the existing path (%path%), rather than overwrite it.If win.com is not called during autoexec.bat, then command.com willprocess the call to win.com.Default autoexec.bat Values
As with the config.sys file, MS-DOS and Windows 9x can function withoutautoexec.bat - though if the autoexec.bat file is missing under MS-DOS,you are prompted to confirm the date at every boot-up.
Windows 2000 and XP will read the autoexec.bat file, but they ignore linesthat execute programs or load TSRs. The only items or lines that are usedout of the autoexec.bat file are statements that set environment variables,such as the system path.
In this tutorial:
To run a command as soon as the command prompt is opened:
These startup options are rarely used, if you set one of the AutoRun keys to launch CMD.exe that will recursively launch new CMD sessions until the machine runs out of memory.
To run a command as soon as a user logs in:
The STARTUP folder (Start Menu)
To run a command as soon as the machine powers up, (like AUTOEXEC.BAT in MS-DOS), use the Windows Task Scheduler - choosing the option:
Run a task:
When my computer starts (before a user logs on)
The autoexec.bat file was an MS-DOS feature. Under Windows there is a still a degree of backwards compatibility - if the file (C:autoexec.bat) exists, any SET statements within it will be parsed at boot time.
Variables set in this way are not available to gui programs - they will be visible from the CMD prompt but don’t appear in the control panel. All other commands in autoexec.bat will be ignored. /moving-wallpapers-for-mac-15762/. This behaviour is to allow old DOS applications to install correctly.
Scripts running at Windows startup
Run Bat File On Startup Windows 10
To see exactly what is running (or running slowly) at windows startup/login, set the following registry key:
Edit Config Sys Windows 10
Autorun events are (mostly) restricted to drives of type DRIVE_CDROM. The default behaviour is to invoke AutoPlay. The NoAutoRun registry entry can be used to disable the AutoPlay and/or AutoRun feature on individual drives. This can be set in the registry under HKCU and/or HKLM. (If both are set then HKLM will take priority.)
The NoDriveTypeAutoRun registry entry disables or enables the AutoRun feature on all drives of the type specified. It can be set in the registry under HKCU and/or HKLM. (If both are set then HKLM will take priority.)
0xFF=Disable AutoRun on all types of drive
0x91=Disable AutoRun on network drives,
0x95=Disable AutoRun on removable + network drives.
The NoDriveAutoRun registry entry disables or enables the AutoRun feature on individual drives. It can be set in the registry under HKCU and/or HKLM. (If both are set then HKLM will take priority.)
In all cases the registry keys are set under:
The registry key HKCUSoftwareMicrosoftWindowsCurrentVersionExplorerMountPoints2 contains cached information about every removable device seen so far. This cache can bypass the registry settings above which can leave a machine vulnerable. See Q967715 for patches that address this issue. Alternatively the iniFileMapping method described below will disable AutoRun completely.
To effectively disable AutoRun in all versions of Microsoft Windows, import the following registry value (source: US-Cert Alert TA09-020A) this applies to any autorun.inf in any location and on any drive:
“The real danger is not that machines will begin to think like men, but that men will begin to think like machines” ~ Sydney J. Harris
SC - Service Control.
SET - Display, set, or remove Windows environment variables.
Q967715 - How to disable the Autorun functionality in Windows.
Q137890 - SRVANY - create an NT Service from any executable. Not supported on current OS's use a Scheduled Task instead.
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