What is fltmgr?

Fltmgr.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if fltmgr.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for fltmgr drivers in need of updating

Fltmgr.sys file information

The process known as Microsoft Filesystem Filter Manager or FltMgr belongs to software Microsoft Windows Operating System or FltMgr by Microsoft (

Description: The original fltmgr.sys is an important part of Windows and rarely causes problems. Fltmgr.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 129,792 bytes (75% of all occurrences), 192,056 bytes or 124,800 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. It is a trustworthy file from Microsoft. Fltmgr.sys is a Windows system file. fltmgr.sys appears to be a compressed file. Therefore the technical security rating is 0% dangerous, however you should also read the user reviews.

Recommended: Identify fltmgr.sys related errors

Important: Some malware disguises itself as fltmgr.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the fltmgr.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

It crashes windows vista very often for me
It is still present in Windows Vista and is usually safe.
Was responsible for one Bluescreen under Win 2000 recently.
Causes system crashes on Vista laptop with HDMI
Problems if illegal copies were made
Microsoft Componant
  John Sadler  
It crashes windows 7 very often for me
Often on BSODs under Win 7 x64, but I doubt that this file causes the bluescreen...
fltmgr.sys is an essential Kernel Frame file and it will b/ NOT /b crash your System. This is installed as an essential part of your Operating System. Do NOT mess with the Kernel (the core) of your OS.
  DNSDAEMON   (further information)
Crashes of my Win7 Ultimate caused by this file
Caused bluescreen on Windows7
Several Blue screen Of death with Windows 7 French
it is a vital system file. DO NOT REMOVE!
nothing at all, but did cause a BSOD for me
Identified as file that has caused blue screen of death with my XP SP3 OS.
  Eugene M Schwarz  
Caused BSOD on Windows 7 Ultimate x64
  Broken Arrow  
I believe FLTMRG.EXE is Fault Manager. About 2-5 minutes before my BSOD I see AdAware fault. First once and 3 times in sucession. Always I get the BSOD implicating fltmgr.exe but I think it's really AdAware. I stop AdAware and haven't gotten the BSOD for weeks now.
restarting problem
Pretty sure it is a necessary Windows file, however it is the #1 cause of BSoD's on my W7 Home Premium (Running on an ASUS G74Sx).
Caused crash in Windows XP Pro SP3
There are 2 different versions on my computer, and the newer one seems to be a problem with Windows XP SP3. The computer will not run with SP3 installed.
crashed my system, got a blue screen tech error
bsoded my xp sp3, but critical system file
caused often bsod during bootup
It caused a BSOD on Windows 7 Prof. x64 probably because I yanked two USB drives without using Safely Remove first.
  Cary Enoch Reinstein  
Identified as file that has caused blue screen of death with my XP SP3 OS after updating.
XP SP2 worked fine but the SP3 update would not load after updating the system. Booting in Diagnostics mode, the BSOD reported that FLTMGR.SYS was crashing the system.
On XP SP3 it is crashing when i install GTA 4 EFLC
Crashed windows 7 x64 to BSOD multiple times. Usually on startup. Not sure why still...
  Jack H.  
it crashed a win xp sp3 machine, when we restarted it went ok
Was the cause of a BSOD
had a BSOD with that file given on the blue screen info
Manages data for Windows. Viruses, malware, poorly written code, and pirated software cause issues with it. It is safe and important
Started getting BSOD after installing Razer Synapse 2.0 software. Viewing through the BlueScreenView program this file was listed, along with the ntoskrnl.exe file.
It effs up the performance of SourceTree.exe on my machine
  Andrei Rînea  
fltmgr.sys is an essential Windows kernel component. If you remove it, either Windows will replace it or your system will be inoperable. fltmgr is not a cause of crashes, regardless of what your crash dump says. Usually some bad driver or virus protection has broken something that causes a crash in fltmgr.
  jb   (further information)
caused a blue screen of death crash when connecting my phone to the laptop.
flagged by BSOD as culprit yet probably due to antivirus conflict at update time. Update AV core in safe mode if BSOD persist. MS ESET can be an issue, depending on what 3rd Party AV products you have.
  Grey Matter  

Rating chart

Summary: Average user rating of fltmgr.sys: based on 32 votes with 38 user comments. 14 users think fltmgr.sys is essential for Windows or an installed application. 9 users think it's probably harmless. 3 users think it's neither essential nor dangerous. 5 users suspect danger. One user thinks fltmgr.sys is dangerous and recommends removing it. 12 users don't grade fltmgr.sys ("not sure about it").

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Best practices for resolving fltmgr issues

A clean and tidy computer is the key requirement for avoiding problems with fltmgr. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the fltmgr.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

fltmgr.sys [all]