Repair and Download AltTab.dll Now

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

AltTab.dll file Windows Shell Alt Tab. 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 AltTab.dll related errors on your device. You can also download AltTab.dll file compatible with Windows 8.1, Windows 8, Windows 7, Windows 7, Windows Vista, 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 7, Windows Vista, Windows Vista

File info

General information
Filename AltTab.dll
File extension DLL
Description Windows Shell Alt Tab
Program Microsoft® Windows® Operating System
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 AltTab.dll file. AltTab.dll 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 AltTab.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

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



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


Problems related to AltTab.dll 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 AltTab.dll 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.

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

The last solution is to manually download and replace AltTab.dll 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 AltTab.dll file.

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

  • Windows 8.1: C:\Windows\System32\
  • Windows 8: 1: C:\Windows\System32\
  • Windows 7: C:\Windows\SysWOW64\
  • Windows 7: C:\Windows\SysWOW64\
  • Windows Vista: C:\Windows\System32\
  • Windows Vista: C:\Windows\System32\

If the steps did not solve your AltTab.dll 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 AltTab.dll
System Windows 8.1
File size 88064 bytes
Date 2014-11-21
File details
MD5 a08e04bd42a1c863e852898a53bee1cc
SHA1 e5f347c25e226b8317c7b19ecf1333f6a6938d87
SHA256 6c4e099c35bab306d16f389a514bed5a13bcc823d7575cc7206c16c39f0f9120
CRC32 d5e70526
Example file location C:\Windows\System32\
Filename AltTab.dll
System Windows 8
File size 67584 bytes
Date 2012-07-26
File details
MD5 79cce53f5e0d6466eee6bc94df265722
SHA1 b6b93824328050aff6eedc44ceb4274229317950
SHA256 7a4c934771e8e02340f0dd938483e67ad24a08565060f272c2e782f2efe8a8bd
CRC32 d8e537c7
Example file location 1: C:\Windows\System32\
Filename AltTab.dll
System Windows 7
File size 46592 bytes
Date -0001-11-30
File details
MD5 b2b3dae040f6b5ae1df52b0cd7631a18
SHA1 7f618396a910908019b5580b4da9031af4a433ca
SHA256 062680eff24eb83ff34ddd76043db9abb476c8fee7bbe869a1e7f7fc8891314f
CRC32 beefd3cf
Example file location C:\Windows\SysWOW64\
Filename AltTab.dll
System Windows 7
File size 53248 bytes
Date 2009-07-14
File details
MD5 e7368f0a8d19445eaf5c5d0dbb8b8dab
SHA1 1e2855f4d42d53349ef65290b237fa195ff1f49b
SHA256 cf9082360e32a7c3e13a67ac2c6192f4a76870d43da9ff2936993a637f712761
CRC32 708ef1a4
Example file location C:\Windows\SysWOW64\
Filename AltTab.dll
System Windows Vista
File size 43008 bytes
Date -0001-11-30
File details
MD5 4a839160ed1963f9a1526dda2d1233b2
SHA1 f870ee89cf44d62e5ebabd45aaf30c11d304e0e9
SHA256 1586b0d89994c37df8dc045aea91ba6a26b59dbdf9fb57c4bb7482922cc5b0f2
CRC32 1be4cab9
Example file location C:\Windows\System32\
Filename AltTab.dll
System Windows Vista
File size 48640 bytes
Date 2006-11-02
File details
MD5 fdac777249fc4a5ed75ff3f563817fa1
SHA1 b5f88b40ab540e1fcf88e42e184b051e447d7560
SHA256 bec8a33ab3d3605cb712d57f9883497ed651c3c914731bd7320852769ca12d51
CRC32 aedfe34a
Example file location C:\Windows\System32\