DLL Tool

How to fix MMDevApi.dll errors

June 20, 2014

DLL ToolDLL TOOL downloads MMDevApi.dll and repair MMDevApi.dll missing or not found error for PCs installed with Microsoft operating systems such as Windows XP and Windows 7.

About MMDevApi.dll

With description MMDevice API, MMDevApi.dll is one of the three components of Core Audio APIs on Windows Vista and Windows 7 operating system. Microsoft has provided a set of new audio suite for improving the sound quality by implementations of Core Audio APIs, which are the basis for higher APIs, such as DirectSound、DirectMuisc、waveXxx、mixerXxx and so on.

The three components of Core Audio APIs are respectively MMDevice API, WASAPI and DeviceToplogyAPI. Mmdevice (The Windows Multimedia Device) API is used for audio clients to discover audio endpoint devices, determine their capabilities, and create driver instances for those devices. WASAPI (Windows Audio Stream API) is used to create and manage the audio stream from and to endpoint devices of audio clients. DeviceToplogyAPI directly fetches the topological structure and its functions of hardware devices.

The MMDevice API consists of several interfaces that are defined by Header file Mmdeviceapi.h. The IMMDevice interface contains the generic features of a multimedia device resource and the audio endpoint device is the only type of device resource available with an IMMDevice interface in the current implementation of the MMDevice API for creating a collection of endpoint objects, each of which represents an audio endpoint device in the system. Each endpoint object in the collection supports the IMMDevice interfaces.

Typical symptoms of MMDevApi.dll errors

  1. All of your media players in all applications stopped working. Clicking on them, they open briefly, and then stop with the message that they have encountered an error and will close.
  2. Windows 7 crashed. After lengthy self-repair, computer works but MMDevAPI.DLL contains errors.
  3. C:\Windows\system32\MMDevAPI.dll is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support.
  4. Every time you launch the game it begins to load and then you see the error message: bioshock.exe has stopped working with the error log which indicates a windows library MMDevAPI.dll has failed.

Causes of MMDevApi.dll errors

First of all, it is the corruption problem of MMDevApi.dll or related dll files, such as bioshock.exe.

Secondly, it is due to corrupted registry keys.

How to fix the MMDevApi.dll errors?

Run SFC scannow and restart the computer, the computer will do a self-repair this way and may solve the corrupted system file itself by replacement with backup MMDevApi.dll file.

If this doesn't fix the error, it will be good choice to check the registry for any related corrupted keys. Failure of SFC scannow could indicate that there may be an invalid registry key of MMDevApi.dll file and needs to be repaired for removing the error successfully.

In some cases, you can reinstall Itunes, Windows Media Player, or re-install Windows 7 and the game and make sure that you have the latest version of all the drivers for your system. It all these fail to resolve the issue, just run DLL TOOL to scan your pc and auto diagnose and repair the dll errors as well as registry malfunctions altogether.

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