d3dcompiler_39.dll Is Missing: Fixes for Windows 10 and 11

d3dcompiler_39.dll is missing because an older DirectX component was not installed, was removed, or no longer matches the application that needs it. The safest first fix is to run the affected game’s bundled DirectX setup or install Microsoft’s DirectX End-User Runtimes (June 2010), rather than downloading the DLL by itself.

Property	Details
File	d3dcompiler_39.dll
Category	DirectX
Function	Legacy Direct3D HLSL shader compiler and related compiler APIs
DirectX lineage	DirectX SDK August 2008
Common 32-bit version	9.24.949.2307
Common 32-bit size	Approximately 1.42 MB
Architectures	Separate x86 and x64 builds
Installed by	The program, game, or DirectX package that deployed it

The file is a genuine Microsoft Direct3D component, but it is not the modern DirectX core built into Windows. It belongs to the optional, side-by-side DirectX runtime components used by older games and applications.

As an Amazon Associate I earn from qualifying purchases.

What d3dcompiler_39.dll does

Games use shader programs to control how lighting, textures, shadows, reflections, and other graphics are rendered. d3dcompiler_39.dll provides an older Direct3D compiler interface that can compile HLSL shader code and support related Direct3D compiler functions.

The _39 suffix identifies a particular side-by-side compiler version. It is not interchangeable with d3dcompiler_43.dll, d3dcompiler_47.dll, or another numbered DirectX compiler file. Renaming a different DLL does not create a compatible replacement.

Microsoft’s documentation places D3DCompiler_39 in the DirectX SDK August 2008 lineage. The DirectX component model and installation behavior are described in Microsoft’s DirectX installation guidance for game developers.

Why Windows 10 or 11 can still need it

Windows 10 and Windows 11 include modern DirectX versions, but that does not mean every historical DirectX side-by-side component is installed. Newer DirectX versions do not replace every older compiler DLL that a game may request.

A clean Windows installation, a fresh game installation, a skipped first-run prerequisite, or an interrupted setup can leave the optional legacy components absent. Windows Update also does not normally install these optional DirectX runtime files.

This is why a modern computer can report that d3dcompiler_39.dll is missing even though DirectX 11 or DirectX 12 is available. The game is asking for a specific older component, not merely checking whether any version of DirectX exists.

What the error messages mean

The wording depends on Windows, the application, and the point at which the loader failed. Common messages include:

• “The program can’t start because d3dcompiler_39.dll is missing from your computer.”
• “This application failed to start because d3dcompiler_39.dll was not found.”
• “The code execution cannot proceed because d3dcompiler_39.dll was not found.”
• “Error loading d3dcompiler_39.dll. The specified module could not be found.”
• “d3dcompiler_39.dll is either not designed to run on Windows or it contains an error.”
• “Bad Image,” sometimes accompanied by status 0xc000012f.

These messages do not all prove that the file is physically absent.

“Missing” or “not found”

The expected DirectX component is absent from the location where the application looks, or the application is using a different architecture from the installed component.

“Could not be loaded”

Windows found a reference to the library but could not load it. The file may be corrupt, the wrong architecture, in the wrong application directory, or incompatible with another file that the program loads.

“Not designed to run on Windows”

This is commonly a loader or “Bad Image” error. It can indicate a damaged DLL, a manually copied file from an untrusted source, or an x86/x64 mismatch. It does not automatically mean that Windows itself is unsupported.

Fix 1: Run the game’s bundled DirectX installer

If the error belongs to a game, check its installation folder first. Many games include the exact legacy DirectX files they require.

Look for folders named:

• Redist
• DirectX
• DirectXRedist
• _CommonRedist
• Installers

Then look for DXSETUP.exe.

1. Close the game and its launcher.
2. Open the game’s installation folder.
3. Open the folder containing the DirectX redistributable.
4. Right-click DXSETUP.exe.
5. Select “Run as administrator.”
6. Follow the installation wizard.
7. Restart Windows.
8. Start the game again.

If the installer asks to repair or install components, allow it to complete. Do not cancel the prerequisite installation during the game’s first launch. Steam explains that games may include secondary DirectX installers and that a canceled prerequisite can sometimes be run manually from the game folder in its DirectX and game troubleshooting guidance.

This is the best first step when the problem affects one game because the bundled package may contain the exact runtime set expected by that title.

If there is no bundled installer, or if running it does not resolve the error, use Microsoft’s offline package below.

Fix 2: Install Microsoft’s DirectX End-User Runtimes

The most reliable general repair is Microsoft’s official DirectX End-User Runtimes (June 2010) package. It contains the June 2010 and earlier side-by-side DirectX components, including legacy compiler libraries.

The offline download is named:

directx_Jun2010_redist.exe

Microsoft lists the package as version 9.29.1974.1. It does not upgrade the core DirectX version already included in Windows. Instead, it adds older components that applications may still require.

Install the offline package

1. Open Microsoft’s DirectX End-User Runtimes (June 2010) page.
2. Download directx_Jun2010_redist.exe.
3. Save it to a location you can find easily, such as Downloads.
4. Double-click the downloaded file.
5. Accept the license terms.
6. When asked where to extract the files, create a new folder such as:

C:\DXRedist

1. Open C:\DXRedist.
2. Right-click DXSETUP.exe.
3. Select “Run as administrator.”
4. Complete the DirectX setup.
5. Restart Windows.
6. Launch the affected game or application.

The first executable only extracts the package. The actual installation is performed by DXSETUP.exe. Running the extraction file and closing it without running DXSETUP.exe does not complete the repair.

If an administrator prompt appears, approve it only when the file came from Microsoft’s download page. After setup finishes, test the application before making other system changes.

Use the web installer when appropriate

Microsoft also provides the DirectX End-User Runtime Web Installer, commonly named:

dxwebsetup.exe

The web installer downloads the required components during setup. It can be convenient when the computer has a reliable internet connection, but the offline June 2010 package is preferable when troubleshooting repeated installations, multiple games, or a machine with restricted connectivity.

The web installer and offline package install legacy side-by-side components. Neither upgrades the modern DirectX core already included in Windows.

Check whether the repair worked

The repair worked if:

• The application starts normally.
• The same DLL message no longer appears.
• The game’s graphics initialize instead of closing during launch.
• A later error identifies a different missing prerequisite.

If the error remains unchanged after a successful DirectX setup, continue with application repair and architecture checks. Do not immediately download an individual DLL.

Fix 3: Verify or repair the game files

The DirectX runtime may be installed correctly while the game itself has incomplete or damaged files. This can happen after an interrupted update, failed installation, disk error, unsupported mod, or antivirus quarantine.

Steam

1. Open Steam.
2. Select “Library.”
3. Right-click the affected game.
4. Select “Properties.”
5. Open “Installed Files.”
6. Select “Verify integrity of game files.”
7. Wait for the process to finish.
8. Restart Steam.
9. Run the game again.

Steam’s official file verification instructions explain this process.

A successful verification does not prove that the DirectX prerequisite was installed. If Steam reports that the game files are valid but the DLL error remains, run the game’s own DXSETUP.exe as described earlier.

Epic Games Launcher

1. Open Epic Games Launcher.
2. Select “Library.”
3. Find the affected game.
4. Select the three dots beside the game.
5. Choose “Manage.”
6. Select “Verify.”
7. Wait for verification to finish.
8. Start the game again.

Epic documents this process in its official file verification instructions.

Other launchers

For another launcher, open the game’s installation or management menu and use its Verify, Repair, or Scan action. If verification succeeds but the error remains, check for a bundled Redist\DirectX folder and run its installer manually.

If the game has been heavily modified, temporarily remove unsupported mods and test an unmodified installation. A mod can place an incorrect DLL beside the game executable or change the files that the launcher expects.

Fix 4: Check x86 and x64 architecture

A 64-bit Windows installation can still require the x86 DirectX component. The important question is the architecture of the application, not only the architecture of Windows.

• A 32-bit game normally needs the x86 DirectX runtime.
• A native 64-bit game needs the x64 runtime.
• A 64-bit PC running a 32-bit game still needs the x86 component.

Do not assume that copying a file from System32 or SysWOW64 will solve this. Windows uses those folders according to its system architecture rules, and the application may instead expect a private copy beside its executable.

The DirectX setup program is designed to install the appropriate side-by-side components. Re-run the official DXSETUP.exe rather than trying to guess which individual DLL belongs in which folder.

An architecture mismatch can produce either a missing-module message or a “not designed to run on Windows” error. A DLL with the correct filename but the wrong binary is not a valid repair.

Fix 5: Check antivirus quarantine

Security software may remove or quarantine a game file after an update, mod installation, or false positive detection.

In Windows Security:

1. Open the Start menu.
2. Search for “Windows Security.”
3. Open it.
4. Select “Virus & threat protection.”
5. Select “Protection history.”
6. Review recent detections.
7. Open an item related to the game or DirectX.
8. Confirm the file path and detection details.
9. Do not restore or allow the file unless its source is trusted and the detection has been confirmed as a false positive.

Microsoft explains Protection History in its Windows Security guidance.

Reinstalling the official game package or Microsoft’s DirectX runtime is generally safer than restoring an isolated DLL. If the file came from a random DLL download page, remove it rather than adding an exception.

If the antivirus repeatedly quarantines a file installed by the official game or Microsoft package, update the security definitions and contact the software vendor before allowing the file.

Fix 6: Reinstall the affected application

If only one application reports the error and its launcher verification does not help, repair or reinstall that application.

Before reinstalling:

1. Confirm that saved games or settings are backed up if they are not stored in the cloud.
2. Uninstall the application through Windows or its launcher.
3. Restart Windows.
4. Download the installer from the application’s official source or reinstall it through the authorized launcher.
5. Allow every prerequisite installer to complete.
6. Restart Windows again.
7. Test the application before reinstalling mods or custom files.

For a game-specific deployment problem, reinstalling the game remains the definitive repair. The game’s own installer may place the correct DirectX components in an application-local folder that a generic Windows repair cannot recreate.

Fix 7: Check for a wrong or manually copied DLL

If d3dcompiler_39.dll exists but the application still fails, the file may be:

• In the wrong directory.
• The wrong architecture.
• Corrupt.
• Replaced by a mod.
• From an unofficial source.
• Blocked or quarantined.
• Not the copy that the application is loading.

Do not rename d3dcompiler_43.dll or d3dcompiler_47.dll to d3dcompiler_39.dll. Those are separate side-by-side versions.

Do not overwrite files in C:\Windows\System32 or C:\Windows\SysWOW64 with an arbitrary download. End users should also avoid copying a DLL from another computer, even when the filename looks correct.

Developers can legitimately deploy the exact signed DirectX component beside an application when their distribution method requires app-local deployment. That is different from downloading an unverified DLL to repair a consumer installation.

If you already copied a DLL manually into the game folder, remove that untrusted copy only after confirming it is not part of the official installation, then run the game’s repair or reinstall process.

Fix 8: Repair broader Windows component corruption

System File Checker and DISM are not the primary repair for d3dcompiler_39.dll. This file is normally an optional DirectX component, not a standard modern Windows core file.

Use Windows component repair when:

• Several unrelated system DLLs fail.
• Windows has update or servicing errors.
• Settings and built-in applications are also malfunctioning.
• The DirectX installer fails because Windows itself appears damaged.
• The problem affects many applications rather than one game.

Open an elevated Command Prompt:

1. Open Start.
2. Type Command Prompt.
3. Right-click “Command Prompt.”
4. Select “Run as administrator.”
5. Select “Yes” at the User Account Control prompt.
6. Run:

DISM.exe /Online /Cleanup-Image /RestoreHealth

1. Wait for DISM to finish.
2. Then run:

sfc /scannow

1. Wait until the scan reaches 100 percent.
2. Restart Windows.
3. Run the DirectX installer again if it previously failed.

Microsoft recommends running DISM before SFC in its System File Checker guidance.

These commands may repair Windows servicing problems, but they may not restore an app-local or optional legacy DirectX DLL. If the application still reports the same error, return to the official DirectX package and application repair steps.

When repeatedly running SFC and DISM produces no useful change, Outbyte PC Repair can provide a free scan showing what Windows problems it detects; repair actions are performed by the full version, and reinstalling the affected game remains the definitive fix when the missing file belongs to that application.

Fix 9: Install Windows updates when the system has wider problems

Windows Update is not normally the source of optional legacy DirectX components, but it can repair broader operating-system issues and servicing failures.

On Windows 11:

1. Open Start.
2. Select “Settings.”
3. Select “Windows Update.”
4. Select “Check for updates.”
5. Install available updates.
6. Restart when requested.
7. Return to Windows Update and check again.

On Windows 10:

1. Open Start.
2. Select “Settings.”
3. Select “Update & Security.”
4. Select “Windows Update.”
5. Select “Check for updates.”
6. Install available updates.
7. Restart Windows.

Microsoft provides additional steps in its Windows Update instructions.

Do not treat a fully updated system as proof that d3dcompiler_39.dll should already exist. Windows updates and the optional DirectX End-User Runtime serve different purposes.

Fix 10: Update or reinstall the graphics driver only when symptoms support it

An NVIDIA, AMD, or Intel graphics driver usually does not install d3dcompiler_39.dll. This DLL is a DirectX side-by-side compiler component, not the display driver itself.

Driver repair is appropriate when the DLL message is accompanied by:

• Display-driver crashes.
• Black screens.
• Rendering corruption.
• Device Manager warnings.
• Games failing with broader graphics initialization errors.
• Problems beginning immediately after a driver update.

To check the driver through Device Manager:

1. Right-click the Start button.
2. Select “Device Manager.”
3. Expand “Display adapters.”
4. Right-click the graphics adapter.
5. Select “Properties.”
6. Open the “Driver” tab.
7. Note the provider and driver date.
8. Select “Update Driver.”
9. Choose “Search automatically for drivers.”
10. Restart Windows if a driver is installed.

To reinstall the existing driver:

1. Open “Device Manager.”
2. Expand “Display adapters.”
3. Right-click the graphics adapter.
4. Select “Uninstall device.”
5. Confirm the removal if prompted.
6. Restart Windows.
7. Allow Windows to detect the adapter.
8. Install the current driver from the graphics manufacturer’s official support channel if necessary.

Microsoft documents the Device Manager process in its driver update and reinstallation guidance.

When manually checking many driver versions is taking longer than the underlying diagnosis, Outbyte Driver Updater can scan for driver problems and show what it finds; driver installation is handled by the full version, and it is not required for a standalone DirectX runtime problem.

Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Support on Ko-Fi

Fix 11: Use System Restore only after a known system change

System Restore is justified when the problem began immediately after a known driver, application, update, or configuration change and a suitable restore point exists.

1. Press Windows key plus R.
2. Type:

rstrui.exe

1. Press Enter.
2. Select “Next.”
3. Choose a restore point created before the problem began.
4. Select “Scan for affected programs” if available.
5. Review the changes.
6. Select “Next,” then “Finish.”
7. Allow Windows to restart.

Microsoft describes this process in its System Restore guidance.

System Restore does not replace a proper game installation or guarantee that an optional DirectX component will be added. Use it when the timing strongly points to a recent system change.

What not to do

Do not download the DLL from a random DLL website

Standalone DLL download sites can provide malware, an altered binary, the wrong architecture, or an incompatible version. Even a clean file may not fix the actual problem because the game’s DirectX prerequisite, related files, or launcher installation is still incomplete.

Use the game’s official installer or Microsoft’s June 2010 DirectX package. For a web-based installation, use Microsoft’s DirectX End-User Runtime Web Installer.

Do not replace it with another numbered compiler

d3dcompiler_39.dll, d3dcompiler_43.dll, and d3dcompiler_47.dll are separate side-by-side components. Renaming one to imitate another can create a Bad Image error or cause the application to fail later.

Do not copy it into System32 or SysWOW64

The correct location depends on the application, architecture, and installation method. Arbitrary copying can overwrite a legitimate file, confuse the loader, and make later repairs harder.

Do not use regsvr32

Do not run:

regsvr32 d3dcompiler_39.dll

regsvr32 is used for DLLs that expose the COM registration entry point DllRegisterServer. d3dcompiler_39.dll is a compiler API library, not a COM registration server, so registering it is not a valid repair. It may produce an error such as “The module was loaded but the entry point DllRegisterServer was not found.”

Do not install Visual C++ Redistributable as the first fix

Visual C++ Redistributable and DirectX are different runtime families. Installing Visual C++ may be necessary for a separate error, but it does not normally restore d3dcompiler_39.dll.

Do not start with a graphics driver update

A driver update is not the normal source of this DLL. Install the legacy DirectX runtime first unless the computer also has clear display-driver symptoms.

If the launcher says the files are valid

A successful file verification means the launcher found no difference in the files it checks. It does not prove that:

• The DirectX prerequisite ran successfully.
• The correct x86 or x64 component is installed.
• Antivirus did not remove a file afterward.
• A mod has not added an incompatible DLL.
• The game is using the installation you verified.
• The error is coming from a different application directory.

Work through these checks:

1. Confirm the exact game installation path.
2. Run the game’s bundled DXSETUP.exe.
3. Install Microsoft’s June 2010 offline DirectX runtime.
4. Check Windows Security Protection History.
5. Remove unsupported mods temporarily.
6. Confirm that the shortcut points to the intended installation.
7. Repair or reinstall the game if the error remains.
8. Check whether the application is 32-bit or 64-bit.

If only one Windows user account is affected, investigate that account’s launcher cache, permissions, and path settings. That pattern is a diagnostic clue, not proof of a file-specific Windows problem.

If DXSETUP.exe fails

A failed DirectX setup can be caused by an incomplete download, a problematic extraction path, permissions, or broader Windows servicing damage.

Try this sequence:

1. Download the offline package again from Microsoft.
2. Create a short local folder:

C:\DXRedist

1. Extract the package there.
2. Open the folder.
3. Right-click DXSETUP.exe.
4. Select “Run as administrator.”
5. Restart Windows after setup finishes or fails.
6. Review these logs:

C:\Windows\DXError.log
C:\Windows\DirectX.log

If the logs indicate broader Windows failure, run DISM and SFC in the order shown earlier. Do not install the legacy DirectX SDK to repair a game runtime. The SDK is a developer package and has separate installation concerns, including documented conflicts involving certain Visual C++ components.

When to contact support

Support staff should request the information needed to distinguish a missing runtime from an application or architecture problem:

• The exact error text and any status code.
• The name and version of the affected game or application.
• Whether the application is 32-bit or 64-bit.
• The full path shown in the error, if any.
• The launcher being used.
• Whether the game’s bundled DirectX installer was run.
• Whether Microsoft’s June 2010 runtime was installed.
• Whether the launcher verification completed successfully.
• Whether the problem began after an update, driver change, mod installation, or reinstall.
• Whether Windows Security shows a quarantine or detection.
• Whether other applications report different missing DLLs.
• Whether the file is present and where it was found.

This information usually identifies whether the next step is DirectX setup, application repair, antivirus investigation, architecture correction, or broader Windows servicing repair.

FAQ

Is d3dcompiler_39.dll part of Windows?

It is a Microsoft Direct3D component, but it is an optional legacy DirectX side-by-side component rather than part of the modern DirectX core installed with Windows 10 or Windows 11.

Which DirectX release supplied it?

Microsoft’s DirectX history identifies D3DCompiler_39 with the DirectX SDK August 2008 lineage. The June 2010 End-User Runtime package includes June 2010 and earlier side-by-side components.

Do I need the x86 or x64 file?

A 32-bit application needs the x86 component, even on 64-bit Windows. A native 64-bit application needs the x64 component. Running the official DirectX setup is safer than selecting an individual file manually.

Does Visual C++ Redistributable fix this error?

Normally, no. Visual C++ Redistributable is a separate runtime. Install the DirectX End-User Runtime for a d3dcompiler_39.dll error unless the application reports a separate Visual C++ error.

Will updating my NVIDIA, AMD, or Intel driver fix it?

Usually not. The file belongs to the DirectX runtime, not the display driver. Update the graphics driver when the computer also has crashes, black screens, rendering problems, or Device Manager errors.

Should I use Windows Features?

There is no general Windows Features checkbox that installs d3dcompiler_39.dll. You can open “Turn Windows features on or off” from the Start menu, but enabling unrelated features such as legacy components is not a substitute for the official DirectX End-User Runtime.

Should I register the DLL?

No. regsvr32 is not appropriate for this Direct3D compiler library.

What if the DLL exists but the error remains?

The copy may be corrupt, the wrong architecture, in the wrong directory, blocked by antivirus, or overridden by a mod. Run the official DirectX setup, verify the game, check Protection History, and remove untrusted manually copied files.

Can Windows Update install it?

Windows Update can repair broader Windows problems, but it is not normally the source for optional legacy DirectX components. Install the official DirectX package instead.

When should I use SFC or DISM?

Use them when multiple Windows components are failing, Windows servicing appears damaged, or the DirectX installer itself fails. They are not the normal first repair for one missing optional DirectX DLL.

Is System Restore appropriate?

Use it when the error began after a known system change and a restore point from before that change exists. Otherwise, repair the DirectX runtime and affected application first.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.