Fix For winmm.dll Errors

What is a DLL?

DLL (Dynamic Link Library) files contain computer code and resources that can be used by multiple programs at the same time. This uses less system memory and helps your computer system run more efficiently. DLL files give program developers the ability to reuse code to add features to several programs without the need to write new code for each program.

There are many programs that require DLL files to function properly so when one of them is damaged or missing it will cause program crashes and poor system performance.

What is winmm.dll?

The Multimedia Control Interface (MCI) provides a device-independent way to use multimedia features of Windows by putting a layer of functionality between you, the programmer, and the devices which would normally be used to handle multimedia data such as the video and sound cards. This functionality is handled by the winmm.dll application.

The winmm.dll module is responsible for talking to the Windows device drivers and multimedia hardware. When you issue commands to the winmm.dll module using the API call mciSendString the commands are translated into calls to the appropriate Windows device driver. In actuality you are calling the subroutines and functions embedded in Windows in order to perform an action. This is because MCI is an independent object that can be programmed and has its own programming language.

The winmm.dll application needs to be initialized correctly by using MCI commands subdivided into four categories which are System Commands, Required Commands, Basic Commands, and Extended Commands. These MCI commands are device-independent but they have the ability to control various multimedia devices. They correspond directly to a button on the Multimedia Control Interface.

The MCI is essentially a Visual Basic interface to these commands. Commands like Play or Close have equivalents in the winmm.dll module command structure of the Win32 API. For example Play is equivalent to MCI_PLAY, Next corresponds to MCI_SEEK, and EJECT is MCI_SET.

The winmm.dll file consists of four parts namely the AVIVideo, the CDAudio, the Sequencer, and the WaveAudio. Each of these so-called devices can play certain types of files such as the AVIVideo which plays AVI files, the CDAudio which plays CD tracks, the Sequencer which plays MID files, etc.

Suggested fix if you are receiving winmm.dll error messages:

DLL files are important parts of your operating system and many programs require them to function. When these files become damaged or are missing it causes poor system performance and system crashes. To fix these problems the user must replace the damaged file with a valid working version. If a working version cannot be found the user may perform a reinstallation of their operating system.

Winmm.dll is created by:

Microsoft Corporation

Known file path:


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