How to Download and Fix AspNetMMCExt.dll?

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

AspNetMMCExt.dll file .NET Framework. 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 AspNetMMCExt.dll related errors on your device. You can also download AspNetMMCExt.dll file compatible with Windows 7, Windows Vista devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows 7, Windows Vista

File info

General information
Filename AspNetMMCExt.dll
File extension DLL
Description .NET Framework
Program Microsoft® .NET Framework
Author Microsoft Corporation
MIME type application/octet-stream
File type Dynamic link library
System Win32
Copyrights © Microsoft Corporation. All rights reserved.
Character set Unicode
Comments Flavor=Retail

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

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



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


Problems related to AspNetMMCExt.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 AspNetMMCExt.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.

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

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

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

  • Windows 7: C:\Windows\Microsoft.NET\Framework64\v2.0.50727\
  • Windows Vista: C:\Windows\Microsoft.NET\Framework64\v2.0.50727\

If the steps did not solve your AspNetMMCExt.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 AspNetMMCExt.dll
System Windows 7
File size 507904 bytes
Date 2009-06-10
File details
MD5 11b30a8447a724c6e9fbf6261ac0da6e
SHA1 155481dd669103e9905ca70a546a17d5fd66c7cd
SHA256 26f9d10e3662e6ae58c2aae522157ebf50fda374e2e508f31dfc9146e14370c7
CRC32 ad905ac6
Example file location C:\Windows\Microsoft.NET\Framework64\v2.0.50727\
Filename AspNetMMCExt.dll
System Windows Vista
File size 507904 bytes
Date -0001-11-30
File details
MD5 542af30a979e29ff4f0fdfbd967962db
SHA1 2777ad4d8d24d26d142a27d18d94fb0b99ea7257
SHA256 ea6e99f298ca3e918f04f1b61e09f9ba4de50e956209f0bbaa6d094c90e267db
CRC32 52782aa6
Example file location C:\Windows\Microsoft.NET\Framework64\v2.0.50727\