How do I fix "d3dx10_40.dll is missing" error?

Install the DirectX End-User Runtime from Microsoft. This package includes d3dx10_40.dll and other DirectX components needed by games. Download from: https://www.microsoft.com/en-us/download/details.aspx?id=35

Is it safe to download d3dx10_40.dll?

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

Where should I put d3dx10_40.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.

DirectX Version 10.40.0.0

Fix d3dx10_40.dll Missing Error

Scanned: 2025-11-30

MD5 Verified

0.2M+ downloads

⚡ Quick Fix: Install DirectX End-User Runtime

This is the recommended fix from Microsoft. It will restore d3dx10_40.dll and all related runtime files automatically.

Download Official Package From Microsoft.com

Common Error Messages

✗ d3dx10_40.dll is missing

What is d3dx10_40.dll?

D3DX10_40.DLL provides DirectX 10 graphics functionality.

How to Fix "d3dx10_40.dll is missing" Error

1 Method 1: Install DirectX End-User Runtime (Recommended)

This package includes all legacy DirectX files (d3dx9, xinput, xaudio, etc.)

Download DirectX End-User Runtime Web Installer
Run dxwebsetup.exe
Follow the installation wizard
Restart your computer

2 Method 2: Verify Game Files (For Steam Games)

If this error occurs in a Steam game:

Open Steam Library
Right-click the game → Properties
Go to Local Files tab
Click "Verify integrity of game files"

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