How do I fix "mp3dec.dll is missing" error?

Reinstall the software that requires mp3dec.dll, or install the latest drivers for your hardware.

Is it safe to download mp3dec.dll?

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

Where should I put mp3dec.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.

Driver Version 1.0.0.0

Fix mp3dec.dll Missing Error

Scanned: 2025-11-30

MD5 Verified

1.3M+ downloads

⚡ Quick Fix: Install Audio Codec

This is the recommended fix from Microsoft. It will restore mp3dec.dll and all related runtime files automatically.

Download Official Package From Microsoft.com

Common Error Messages

✗ mp3dec.dll is missing

✗ The program can't start because mp3dec.dll was not found

✗ mp3dec.dll was not found. Re-installing the application may fix this problem.

What is mp3dec.dll?

MP3DEC.dll - MP3 decoder ASI plugin - used by many older games

How to Fix "mp3dec.dll is missing" Error

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