Repair and Download dot3api.dll Now

Sometimes Windows system displays error messages regarding corrupted or missing dot3api.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 dot3api.dll file can therefore effect in failed execution of the started process.

dot3api.dll file 802.3 Autoconfiguration API. 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 dot3api.dll related errors on your device. You can also download dot3api.dll file compatible with Windows 10, Windows 8.1, Windows 8, Windows 7, Windows 7, Windows Vista, Windows Vista, Windows XP devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows 7, Windows Vista, Windows Vista, Windows XP

File info

General information
Filename dot3api.dll
File extension DLL
Description 802.3 Autoconfiguration API
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 dot3api.dll file. dot3api.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 dot3api.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

  • dot3api.dll is corrupted
  • dot3api.dll cannot be located
  • Runtime Error - dot3api.dll
  • dot3api.dll file error
  • dot3api.dll file cannot be loaded. Module was not found
  • cannot register dot3api.dll file:
  • dot3api.dll file could not be loaded
  • dot3api.dll file doesn't exist



Application could not be started because dot3api.dll file is missing. Reinstall the application to solve the problem.


Problems related to dot3api.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 dot3api.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.

dot3api.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 dot3api.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 dot3api.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 dot3api.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 dot3api.dll file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the dot3api.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 dot3api.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 dot3api.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 dot3api.dll file

The last solution is to manually download and replace dot3api.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 dot3api.dll file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of dot3api.dll file example directory paths.

  • Windows 10: C:\Windows\System32\
  • Windows 8.1: C:\Windows\System32\
  • Windows 8: 1: C:\Windows\System32\
  • Windows 7: C:\Windows\SysWOW64\
  • Windows 7: C:\Windows\SysWOW64\
  • Windows Vista: ---
  • Windows Vista: ---
  • Windows XP: ---

If the steps did not solve your dot3api.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 dot3api.dll
System Windows 10
File size 82432 bytes
Date 2017-03-18
File details
MD5 62c50ba21bf6459d36ae8cc481a88d90
SHA1 81438c80d1794a78d3fd6e110a2ef7cd5fd55ce2
SHA256 69808cba46317e5a9457abe9cc584e00a98db022277616a3602d2eda1d2d5620
CRC32 65d31f2b
Example file location C:\Windows\System32\
Filename dot3api.dll
System Windows 8.1
File size 70656 bytes
Date 2014-11-21
File details
MD5 dcf7560da91fbbc955b87677230e35ab
SHA1 1e01ca78d34acaf343294f4c3779e62db9ce2063
SHA256 045715e94eec68c23ffb8ba8d75b590296d3af3400b19c8450ba5bda087eaa8d
CRC32 5cf5c6f4
Example file location C:\Windows\System32\
Filename dot3api.dll
System Windows 8
File size 67584 bytes
Date 2012-07-26
File details
MD5 c0479991841974f8e6af20d17e8a175c
SHA1 dcb26927b1c3917814e0fd42009713a4a63127c1
SHA256 b6bc8a0108d7db62cdbeaaf2ee0fabac1a8f5b88c690958f640eb85a36dc156e
CRC32 dd6adf44
Example file location 1: C:\Windows\System32\
Filename dot3api.dll
System Windows 7
File size 91136 bytes
Date -0001-11-30
File details
MD5 04b88428a872390d235be52d38a9d4ef
SHA1 429716cc3d32c6fa1563901d88cf905dfe7f433f
SHA256 f6954d514b67547738eb012456342d65289b0b18a0304bbad5bdaa3436181c77
CRC32 8c4d596c
Example file location C:\Windows\SysWOW64\
Filename dot3api.dll
System Windows 7
File size 84992 bytes
Date 2010-11-21
File details
MD5 f9afd12bb4b1cfa5fcc0a5b37c604fd2
SHA1 15fc9c7af5b6e4445062ddb1dee8dc7865abe4fd
SHA256 e8acb693b1a78faef292111be3f9b10ba95c76833c06c931a08eaaae39a21334
CRC32 f0e2a43a
Example file location C:\Windows\SysWOW64\
Filename dot3api.dll
System Windows Vista
File size 45056 bytes
Date -0001-11-30
File details
MD5 898abeccd5f0b9a8e8f1318ddb234685
SHA1 e93353053f4bb48d8fae9259a3b6f7c347d391b9
SHA256 cd9b0ae2fdf22b694fd2e3fd92c751aaecddd85779d6f8ccd7efcd3cc8c1161b
CRC32 11169296
Example file location ---
Filename dot3api.dll
System Windows Vista
File size 59904 bytes
Date 2008-01-21
File details
MD5 bc687be08af06ab5fe481bfaffc55c6d
SHA1 c7a159a68a1288f7e99579231fc6b628c9aa5aef
SHA256 de08d9968542a797393e3fb8ebccb8ed7f063a4cd05464b494f61064f33f6859
CRC32 ed4f539f
Example file location ---
Filename dot3api.dll
System Windows XP
File size 26112 bytes
Date 2008-04-14
File details
MD5 8e2cc37ba87d8f681066e0e9c8a19f73
SHA1 50ad68b8a3450c8bd652a039b6f94045975e4b65
SHA256 90536fd502d92ae4fece0c250373742d2e8ac9e9be314070bb28c4a2bea15508
CRC32 e76913c5
Example file location ---