What is tmpreflt?

Tmpreflt.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 tmpreflt.sys is a Windows system file or if it belongs to an application that you can trust.

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

Tmpreflt.sys file information

The process known as Pre-Filter For XP belongs to software VSAPI or Trend Micro OfficeScan Client by Trend Micro (

Description: Tmpreflt.sys is not essential for the Windows OS and causes relatively few problems. The file tmpreflt.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 36,432 bytes (33% of all occurrences), 25,088 bytes or 36,368 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The software has no file description. The program is not visible. It is not a Windows system file. The file is a Verisign signed file. The file is digitally signed. tmpreflt.sys appears to be a compressed file. Therefore the technical security rating is 18% dangerous.

Recommended: Identify tmpreflt.sys related errors

If tmpreflt.sys is located in a subfolder of "C:\Program Files", the security rating is 24% dangerous. The file size is 36,368 bytes. The program is not visible. There is no detailed description of this service. It is not a Windows system file. There is no information about the author of the file. Tmpreflt.sys is a Verisign signed file. The file has a digital signature. tmpreflt.sys appears to be a compressed file.

Uninstalling this variant: If there are any problems with tmpreflt.sys, you could uninstall the program using the Control Panel ⇒ Uninstall a ProgramTrend Micro OfficeScan Client.

Important: Some malware disguises itself as tmpreflt.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the tmpreflt.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.


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Best practices for resolving tmpreflt issues

A clean and tidy computer is the key requirement for avoiding problems with tmpreflt. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the tmpreflt.sys process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

tmpreflt.sys [all]