Troubleshoot dot3msm.dll Errors and Download File

Sometimes Windows system displays error messages regarding corrupted or missing dot3msm.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 dot3msm.dll file can therefore effect in failed execution of the started process.

dot3msm.dll file 802.3 Media Specific Module. 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 dot3msm.dll related errors on your device. You can also download dot3msm.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 dot3msm.dll
File extension DLL
Description 802.3 Media Specific Module
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 dot3msm.dll file. dot3msm.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 dot3msm.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

  • dot3msm.dll is corrupted
  • dot3msm.dll cannot be located
  • Runtime Error - dot3msm.dll
  • dot3msm.dll file error
  • dot3msm.dll file cannot be loaded. Module was not found
  • cannot register dot3msm.dll file:
  • dot3msm.dll file could not be loaded
  • dot3msm.dll file doesn't exist



Application could not be started because dot3msm.dll file is missing. Reinstall the application to solve the problem.


Problems related to dot3msm.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 dot3msm.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.

dot3msm.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 dot3msm.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 dot3msm.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 dot3msm.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 dot3msm.dll file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the dot3msm.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 dot3msm.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 dot3msm.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 dot3msm.dll file

The last solution is to manually download and replace dot3msm.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 dot3msm.dll file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of dot3msm.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 dot3msm.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 dot3msm.dll
System Windows 10
File size 87552 bytes
Date 2017-03-18
File details
MD5 820a79b05a09c2f32afb200a025d6b5d
SHA1 3fa508f7c316abef22c8ee31ad611f1a86bd5984
SHA256 3411ebe74100d3ed5c3cd23529b50be90305e2ea757672dae342bfc957acbaa2
CRC32 ee4c07fd
Example file location C:\Windows\System32\
Filename dot3msm.dll
System Windows 8.1
File size 88064 bytes
Date 2014-11-21
File details
MD5 9d920e40346315e4e0e19decba6c6273
SHA1 9ffd7c672499889d96d30c5a200fcaa8b3cb2076
SHA256 fbedc87f729e2262a6e8c087fcabd48c9c84b833a59ce221b089d2be420a39c0
CRC32 86003975
Example file location C:\Windows\System32\
Filename dot3msm.dll
System Windows 8
File size 84992 bytes
Date 2012-07-26
File details
MD5 488714469400993a3de3b463cd8546b2
SHA1 afb19ccdf36393c350beca0f1c5767da2129b2be
SHA256 b9995ddc846e55496ef3e71c12b77c02b40fa3f78acee9f3af59f467879adee1
CRC32 096cb899
Example file location 1: C:\Windows\System32\
Filename dot3msm.dll
System Windows 7
File size 115200 bytes
Date -0001-11-30
File details
MD5 0ce0812f2bdfed908fb1066ad4b868c7
SHA1 d9d3cbe2db3637421258f1683de3e20fc3b34308
SHA256 076e1695329c60a1f63f71b114d96d4e0d456ca58aa26a5a3b7812cd0f899982
CRC32 5b41ab7a
Example file location C:\Windows\SysWOW64\
Filename dot3msm.dll
System Windows 7
File size 103936 bytes
Date 2010-11-21
File details
MD5 2b734931f36ef571816236d7c792bc80
SHA1 ce638236f21c578358e939df7ff3c1c9cd4dde3b
SHA256 4ae2664bcebe0c49e84eb7f92cc6e11af3bf5e81bbc3c0a451ea8f999fd4951d
CRC32 cc226c03
Example file location C:\Windows\SysWOW64\
Filename dot3msm.dll
System Windows Vista
File size 92160 bytes
Date 2009-04-11
File details
MD5 1f97a9910f45ba77802de68d35bd2829
SHA1 7bb725ec2b1a46aa5f888e2e2b0433d5091d8c8d
SHA256 cd38e3eb0e9fa66111804a933d12b2b251b8f537ab83276143c4549d70560f41
CRC32 8de69b2a
Example file location ---
Filename dot3msm.dll
System Windows Vista
File size 75264 bytes
Date -0001-11-30
File details
MD5 7366ab74cf8489749ac4cbfbaee9f9e2
SHA1 cb8dc19c7f3763fee7ccd4b187e8bd14a3f14fbb
SHA256 b694c2ee60e519a38d2bc9660bdf7d5841a1be5d16febc2fdfc667d0af1b5034
CRC32 745024ae
Example file location ---
Filename dot3msm.dll
System Windows XP
File size 56320 bytes
Date 2008-04-14
File details
MD5 ea39da293c8bbaa0f89419ba64734cc7
SHA1 184731a7c1580e2b61f13a3e72913cf9d72d0b2c
SHA256 23cbd6bde3e2b1e1e026fa5ee163612a4bea4c97fe5897a182307ad377815be1
CRC32 082ab838
Example file location ---