ieapfltr.dat Troubleshoot and Download

Sometimes Windows system displays error messages regarding corrupted or missing ieapfltr.dat files. Situations like that can occur, for example, during a software installation process. Each software program requires certain resources, libraries, and source data to work properly. Corrupted or nonexistent ieapfltr.dat file can therefore effect in failed execution of the started process.

ieapfltr.dat file Microsoft SmartScreen Filter Data File. The file was developed by for use with software. Here you will find detailed information about the file and instructions how to proceed in the event of ieapfltr.dat related errors on your device. You can also download ieapfltr.dat file compatible with Windows 8.1, Windows 8, Windows 7, Windows Vista devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows 8.1, Windows 8, Windows 7, Windows Vista

File info

General information
Filename ieapfltr.dat
File extension DAT
Description Microsoft SmartScreen Filter Data File
Program Windows® Internet Explorer
Author Microsoft Corporation
MIME type application/octet-stream
File type Dynamic link library
System Windows NT 32-bit
Copyrights © Microsoft Corporation. All rights reserved.
Character set Unicode
Language cod English (U.S.)

There are various types of errors related to ieapfltr.dat file. ieapfltr.dat file may be located in wrong file directory on your device, may not be present in the system, or may be infected with malicious software and therefore not work correctly. Below is a list of most common error messages related to ieapfltr.dat file. If you encounter one listed below (or similar), please consider the following suggestions.

  • ieapfltr.dat is corrupted
  • ieapfltr.dat cannot be located
  • Runtime Error - ieapfltr.dat
  • ieapfltr.dat file error
  • ieapfltr.dat file cannot be loaded. Module was not found
  • cannot register ieapfltr.dat file:
  • ieapfltr.dat file could not be loaded
  • ieapfltr.dat file doesn't exist



Application could not be started because ieapfltr.dat file is missing. Reinstall the application to solve the problem.


Problems related to ieapfltr.dat can be addressed in various ways. Some methods are meant only for advanced users. If you don't have confidence in your skills, we suggest consulting a specialist. Fixing ieapfltr.dat file errors should be approached with utmost caution for any mistakes can result in unstable or unproperly working system. If you have the necassary skills, please proceed.

ieapfltr.dat file errors can be caused by various factors, so its is beneficial to try to fix them using various methods.

Step 1: Scan your computer for any malicious software

Virus Scan

Windows files are commonly attacked by malicious software that prevents them from working properly. First step in addressing problems with ieapfltr.dat file or any other Windows system files should be scanning the system for malicious software using an antivirus tool.

If by any chance you don't have any antivirus software installed on your system yet, you should do it immediately. Unprotected system is not only a source of file errors, but, more importantly, makes your system vulnerable to many dangers. If you don't know which antivirus tool to choose, consult this Wikipedia article – comparison of antivirus software.

Step 2: Update your system and drivers.

Windows Update

Installing relevant Microsoft Windows patches and updates may solve your problems related to ieapfltr.dat file. Use dedicated Windows tool to perform the update.

  1. Go to the Windows "Start" menu
  2. Type "Windows Update" in the search field
  3. Choose the appropriate software program (name may vary depending on your system version)
  4. Check if your system is up to date. If any unapplied updates are listed, install them immediately.
  5. After the update has been done,restart your computer in order to complete the process.

Beside updating the system, it is recommended that you install latest device drivers, as drivers can influence proper working of ieapfltr.dat or other system files. In order to do so, go to your computer or device producer's website where you will find information regarding latest driver updates.

Step 3: Use System File Checker (SFC) tool

System File Checker

System File Checker is a Microsoft Windows tool. As the name suggests, the tool is used for identyfing and addressing system file related errors, including those related to ieapfltr.dat file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the ieapfltr.dat file with properly working version. To use the tool:

  1. Go to the Windows "Start" menu
  2. Type "cmd" in the search field
  3. Locate "Command Prompt" result – don't run it yet:
  4. Click the right mouse button and select "Run as Administrator" option
  5. Type "sfc /scannow" in console prompt to start the program and follow the instructions

Step 4: Restoring Windows system

Windows Recovery

Another approach is to restore system to previous state, before the ieapfltr.dat file error occured. In order to restore your system, follow the instructions below

  1. Go to the Windows "Start" menu
  2. Type "System Restore" in the search field
  3. Start the system restore tool – it's name may differ depending on version of the system
  4. The application will guide you through the process – read the messages carefully
  5. After the process has finished, restart your computer.

If all the above-mentioned methods failed and the ieapfltr.dat file problem has not been resolved, proceed to the next step. Remember that the following steps are intended only for advanced users.

Download and replace ieapfltr.dat file

The last solution is to manually download and replace ieapfltr.dat file in appropriate folder on the disk. Select file version compatible with your operating system and click the "Download" button. Next, go to your web browser's "Downloaded" folder and copy the downloaded ieapfltr.dat file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of ieapfltr.dat file example directory paths.

  • Windows 8.1: C:\Windows\System32\
  • Windows 8: 1: C:\Windows\System32\
  • Windows 7: C:\Windows\System32\
  • Windows Vista: C:\Windows\System32\

If the steps did not solve your ieapfltr.dat file problem, you should consult a professional. A probability exists that the error(s) might be device-related and therefore should be resolved at the hardware level. A fresh operating system installation might be necessary – a faulty system installation process can result in data loss.

File versions list

Filename ieapfltr.dat
System Windows 8.1
File size 616104 bytes
Date 2013-07-26
File details
MD5 c17139eaf939964142c7a1aeee02dc81
SHA1 8e0e75f9a601c95af68d22ec89d297012acd1222
SHA256 88b56c86f5a9e6da5e357efdc5c62b6ddf4f314f682bc953a03d0f4cd2e7c768
CRC32 294d6862
Example file location C:\Windows\System32\
Filename ieapfltr.dat
System Windows 8
File size 1400416 bytes
Date 2012-06-21
File details
MD5 8c3d32a4a46326031309a43c52539d7f
SHA1 29fca67e8e238a99b01a93e24788f07335ae1b80
SHA256 2e68c0dcd5e50edb16613fd1fd4a554ab025914138569a89bf11ae317671a555
CRC32 8d79dd3c
Example file location 1: C:\Windows\System32\
Filename ieapfltr.dat
System Windows 7
File size 3698584 bytes
Date 2009-06-10
File details
MD5 ec6a0643fc55e87a12f4c5bc49e9f431
SHA1 6ce4d2285babb654ef23439d6fed934129aabb20
SHA256 fd293ae86362e29946956c5b30b340c461f606ff089458e1e7df248b79154176
CRC32 efe82de7
Example file location C:\Windows\System32\
Filename ieapfltr.dat
System Windows Vista
File size 2455488 bytes
Date 2008-01-21
File details
MD5 9f82486ab58e45781e95ba7a299fb453
SHA1 87fdfeb699b528374b22363e7709bd9264b7d796
SHA256 789239d3166d1229caaa905a0538ae4aeb5712d2365fafcf32fd238ca0613e11
CRC32 ea781a75
Example file location C:\Windows\System32\