Troubleshoot authfw.CHM Errors and Download File

Sometimes Windows system displays error messages regarding corrupted or missing authfw.CHM 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 authfw.CHM file can therefore effect in failed execution of the started process.

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

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

File info

General information
Filename authfw.CHM
File extension CHM
Type Compiled HTML Help
Description Compiled HTML Help
Program Windows 8
Software Windows
Author Microsoft
Software version 8
MIME type application/x-chm
Language cod English (U.S.)

There are various types of errors related to authfw.CHM file. authfw.CHM 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 authfw.CHM file. If you encounter one listed below (or similar), please consider the following suggestions.

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



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


Problems related to authfw.CHM 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 authfw.CHM 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.

authfw.CHM 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 authfw.CHM 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 authfw.CHM 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 authfw.CHM 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 authfw.CHM file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the authfw.CHM 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 authfw.CHM 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 authfw.CHM 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 authfw.CHM file

The last solution is to manually download and replace authfw.CHM 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 authfw.CHM file.

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

  • Windows 8: C:\Windows\Help\mui\0409\
  • Windows 7: C:\Windows\Help\mui\0409\
  • Windows Vista: C:\Windows\Help\mui\0409\

If the steps did not solve your authfw.CHM 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 authfw.CHM
System Windows 8
File size 27109 bytes
Date 2012-07-26
File details
MD5 8ff1a154fc07672f4fc85575102614d3
SHA1 6bf5a90e88a91afa08459b2392d93290a96f8528
SHA256 7d158f58cfa4e0ebdf2b566ae6dfd8f90a0fd0aa01a50d7bfd979c48b55e90f9
CRC32 3daf183c
Example file location C:\Windows\Help\mui\0409\
Filename authfw.CHM
System Windows 7
File size 372080 bytes
Date -0001-11-30
File details
MD5 59fc715f50d68b0afae7fa2074f18a6b
SHA1 4e12ab583e477fd8327569567ec516b8446e7b8a
SHA256 ed9f469218414413d0323d6a8f82ccc711e68f97c1d4fb3332a91e64e6529285
CRC32 94e20436
Example file location C:\Windows\Help\mui\0409\
Filename authfw.CHM
System Windows Vista
File size 114422 bytes
Date -0001-11-30
File details
MD5 7755785bd5aabe04a009564ac1ad861c
SHA1 06f861f4859678bc57356220915aff84d877e53d
SHA256 fb930a62912c14081714a12149748d20ceebbb80f46da5d1638f07536a41743d
CRC32 6747ed96
Example file location C:\Windows\Help\mui\0409\