Error 0xc000007b “The application was unable to start correctly”: how to fix it

Where does error 0xc000007b come from?

Windows is now 64-bit, but many games and programs are still 32-bit. A program can only use DLLs with the same architecture as itself. When Windows finds a DLL with the right name but the wrong architecture, it refuses to start the program with code 0xc000007b (“invalid image format”).

The most frequent causes:

• DLL copied by hand to the wrong place: a 32-bit DLL put in C:\Windows\System32, or a 64-bit DLL put in C:\Windows\SysWOW64 or in the folder of a 32-bit game.
• Incomplete Visual C++ or DirectX package: only the 64-bit version is installed while the game is 32-bit (or the reverse), or the package is damaged.
• Modified program installation: file replaced by a patch or a mod, or deleted by an antivirus.

Not to be confused with code 0xc0000135, which means that a component cannot be found (often the .NET Framework): in that case, the file really is missing.

Step 1: undo the DLL copies made by hand

If you copied one or more DLLs just before the error appeared, this is the first lead:

1. Find the copied files: in the program’s folder (next to its .exe), in C:\Windows\System32 and in C:\Windows\SysWOW64. Sort by Date modified to spot the most recent ones.
2. Check their architecture: on our site, each file page says whether the DLL is 32-bit or 64-bit, and many offer both versions. Replace a file that is in the wrong place with the right version (table below), or remove it.
3. Rather than deleting, rename the file by adding .old to the end of its name: you will be able to undo it. If you replaced an original Windows file, the repair in step 4 restores it.

Yes, on 64-bit Windows, “System32” contains the 64-bit files and “SysWOW64” the 32-bit files: it is counter-intuitive, and it is precisely the source of many 0xc000007b errors.

Step 2: reinstall Visual C++ and DirectX in 32-bit and 64-bit

1. Install or repair the Visual C++ 2015-2022 package in both versions: 32-bit (x86) and 64-bit (x64). Older games also use the 2005 to 2013 packages, available on the official Visual C++ packages page: install them in x86 and x64 too.
2. Package already installed? Settings › Apps › Installed apps › the Visual C++ package concerned › Modify › Repair.
3. Install the legacy DirectX libraries with Microsoft’s official DirectX End-User Runtime.
4. Restart your computer, then launch the program again.

Steam games often ship these packages in their _CommonRedist folder (vcredist and DirectX subfolders): these are exactly the versions the game expects. More details in the Visual C++ errors and DirectX errors guides.

Step 3: repair or reinstall the program

• Steam game: right-click the game › Properties › Installed Files › Verify integrity of game files. Other platforms (Epic, EA, Ubisoft, GOG…) offer a “Verify” or “Repair” function.
• Other program: uninstall it, restart, then reinstall it from its official setup program.
• Recent mod or patch: remove it, it may have replaced a DLL with a version of another architecture.

Step 4: repair Windows

If the error affects several programs, a system file may have been replaced or damaged:

1. Open a Command Prompt as administrator, type DISM /Online /Cleanup-Image /RestoreHealth, wait until it finishes, then type sfc /scannow.
2. Install all Windows Update updates and the latest driver for your graphics card.
3. Restart your computer.

All the details in the missing Windows system DLL guide.

Going further: finding the DLL at fault

Program architecture: a program installed under C:\Program Files (x86) is 32-bit, a program installed under C:\Program Files is generally 64-bit. For a program that starts, Task Manager also shows it: Details tab, right-click the column headers › Select columns › Platform.

DLLs used: the free, open source Dependencies tool shows all the DLLs a program needs, with their location and architecture. Open the program’s .exe file and look for a DLL whose architecture differs from the program’s: that is the one to replace.

DLL files concerned

Each file page offers the download of the file alone and the complete method suited to it.

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