How do I fix "winmm.dll is missing" error?

winmm.dll is a Windows system file. Run System File Checker by opening Command Prompt as Administrator and typing: sfc /scannow. If that doesn't work, try: DISM /Online /Cleanup-Image /RestoreHealth

Is it safe to download winmm.dll?

Yes, when downloaded from official sources. We recommend installing the official Windows Operating System package instead of downloading individual DLL files. This ensures you get a digitally signed, verified file directly from Microsoft.

Where should I put winmm.dll?

For 64-bit applications, place in C:\Windows\System32. For 32-bit applications on 64-bit Windows, place in C:\Windows\SysWOW64. However, we strongly recommend using the official installer instead of manual placement.

Windows System Version 10.0.22621.0

Fix winmm.dll Missing Error

Scanned: 2025-11-30

MD5 Verified

0.2M+ downloads

⚡ Quick Fix: Install Windows Operating System

This is the recommended fix from Microsoft. It will restore winmm.dll and all related runtime files automatically.

Download Official Package From Microsoft.com

Common Error Messages

✗ winmm.dll is missing or corrupt

✗ The procedure entry point could not be located in winmm.dll

What is winmm.dll?

WINMM.dll is a Windows system library providing core operating system functionality.

How to Fix "winmm.dll is missing" Error

1 Method 1: Run System File Checker

sfc /scannow

Open Command Prompt as Administrator and run this command. It will scan and repair corrupted system files.

2 Method 2: DISM Repair

DISM /Online /Cleanup-Image /RestoreHealth

If SFC doesn't work, run this command to repair the Windows image.

Manual Download (Last Resort)

⚠️ Important Warning

Downloading individual DLL files is not recommended. We strongly advise using the official runtime package above. Only use manual download if the official method fails.

If you must manually place the file:
• 64-bit apps: C:\Windows\System32
• 32-bit apps on 64-bit Windows: C:\Windows\SysWOW64