Download and Fix aclui.CHM

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

aclui.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 aclui.CHM related errors on your device. You can also download aclui.CHM file compatible with Windows 8, Windows 7, Windows Vista, Windows XP devices which will (most probably) allow you to solve the problem.

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

File info

General information
Filename aclui.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 aclui.CHM file. aclui.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 aclui.CHM file. If you encounter one listed below (or similar), please consider the following suggestions.

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



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


Problems related to aclui.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 aclui.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.

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

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

Go to the folder where the file should be located and paste the downloaded file. Below is the list of aclui.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\
  • Windows XP: C:\WINDOWS\Help\

If the steps did not solve your aclui.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 aclui.CHM
System Windows 8
File size 39819 bytes
Date 2012-07-26
File details
MD5 e7c7556b62bc90232d222d849ee0ec0c
SHA1 b2f7c376923d5e6411df6f778af9db979231dc93
SHA256 baed9d32ea91b3dcf03b1e212fdd92ad7efca5d6af27171f14f03697a8f8b264
CRC32 3b7ec4e1
Example file location C:\Windows\Help\mui\0409\
Filename aclui.CHM
System Windows 7
File size 85096 bytes
Date -0001-11-30
File details
MD5 20696e2e79e3eba8b2985804c0ea0b21
SHA1 5e149778dda7d9639476a82c0ae43bde150b4d29
SHA256 65029bf18af98a5fe37f4e02c0b9e19436ac88b1eec9801682e64003f9a07dfb
CRC32 4c19f0bc
Example file location C:\Windows\Help\mui\0409\
Filename aclui.CHM
System Windows Vista
File size 74822 bytes
Date -0001-11-30
File details
MD5 e29eab3bf3fe10d8eb86f627549a19f5
SHA1 027639c60ed7c33434edebf4c501e748d4acca44
SHA256 2fa617560f486aefaec43f182677761e565922ab558b880bd4f9ec08cfff9e62
CRC32 8f7d639e
Example file location C:\Windows\Help\mui\0409\
Filename aclui.CHM
System Windows XP
File size 51552 bytes
Date 2008-04-14
File details
MD5 9dc951073edc1e437ea144be4f1db3b4
SHA1 1daec3d189c982e8dec049643139d6f89e49a3c9
SHA256 220298dc03e7f0e342c3ed4172f7efaac3a0efd26ea783973caa45695fa7d232
CRC32 066e8434
Example file location C:\WINDOWS\Help\