How do I fix "mss64.dll is missing" error?

This file is typically included with the game or Steam. Try verifying game files in Steam (right-click game > Properties > Local Files > Verify integrity) or reinstall the game.

Is it safe to download mss64.dll?

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

Where should I put mss64.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.

Gaming Version 1.0.0.0

Fix mss64.dll Missing Error

Scanned: 2025-11-30

MD5 Verified

1.2M+ downloads

⚡ Quick Fix: Install Game Runtime Library

This is the recommended fix from Microsoft. It will restore mss64.dll and all related runtime files automatically.

Download Official Package From Microsoft.com

Common Error Messages

✗ mss64.dll is missing

✗ Game failed to start: mss64.dll not found

What is mss64.dll?

MSS64.dll is a game/middleware library required by various PC games and applications.

How to Fix "mss64.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