vcruntime140_clr0400.dll

What Is vcruntime140_clr0400.dll?

vcruntime140_clr0400.dll is a Microsoft C Runtime (CRT) library distributed with Microsoft Visual Studio and included as part of the Microsoft Visual C++ Redistributable packages. It is a specialized CRT build used by .NET-related native components that require compatibility with the CLR 4.0 runtime.

This DLL supplies core C runtime functions needed by applications or system components that rely on native code built with Visual Studio’s VC14 toolset (Visual Studio 2015–2022 family) and compiled with CLR-specific linking options.

What vcruntime140_clr0400.dll Does

vcruntime140_clr0400.dll provides C runtime support for modules that combine:

• Native C/C++ code
• CLR 4.0 (.NET Framework) hosting or interop
• VC14+ compiler toolchains

It includes routines for:

• Memory allocation
• Exception handling
• Runtime startup code
• Security checks
• Function stubs used by mixed-mode assemblies (C++/CLI)

This DLL is commonly used when applications contain C++/CLI (managed C++) components built using Visual Studio.

Where vcruntime140_clr0400.dll Is Found

It is installed by the Visual C++ Redistributable or included alongside software that depends on these runtime components.

Typical locations:

C:/Windows/System32/
C:/Windows/SysWOW64/
<ApplicationFolder>/ (if shipped privately by an application)

The DLL must match the version expected by the application.

Why Applications Need This DLL

Software uses vcruntime140_clr0400.dll when:

• Native code wraps or hosts .NET components
• A module is built with C++/CLI using the VC14+ compiler
• A mixed-mode assembly performs initialization via the CRT

If the DLL is missing or mismatched, the program cannot start the mixed-mode runtime environment.

Common Errors Related to vcruntime140_clr0400.dll

vcruntime140_clr0400.dll was not found.

The program can't start because vcruntime140_clr0400.dll is missing from your computer.

Unable to load CLR 4.0 compatible C runtime: vcruntime140_clr0400.dll.

Error loading mixed-mode assembly (CRT initialization failure).

These issues usually occur when:

• The required Visual C++ Redistributable is not installed
• A 64-bit program attempts to load the 32-bit DLL (or vice versa)
• The file is corrupted or deleted
• Application dependencies were not shipped correctly
• Updates replaced files with incompatible versions

How To Fix vcruntime140_clr0400.dll Issues

1. Install or Repair the Visual C++ Redistributable

Install the latest Microsoft Visual C++ 2015–2022 Redistributable:

• x86 for 32-bit apps
• x64 for 64-bit apps

This is the most reliable fix.

2. Ensure Application Architecture Matches the DLL

• 32-bit processes require the 32-bit version of the DLL
• 64-bit processes require the 64-bit version

3. Restore Missing/Cleaned Files

Check antivirus quarantine and restore the DLL if necessary.

4. Reinstall the Application

Some programs ship a private version of the DLL.

5. Update Windows

System updates may provide updated VC runtime files.

Manual Install Instructions

If you obtained a clean, verified copy of vcruntime140_clr0400.dll from DLLme, you can restore it manually:

1. Place the DLL into the Application’s Folder (Preferred)

<ApplicationFolder>/

This ensures the application loads the correct version.

2. If Needed, Place It in the System Directory

For applications expecting system-wide installation:

C:/Windows/System32/   (64-bit DLL)
C:/Windows/SysWOW64/   (32-bit DLL)

3. Restart the Application

The runtime loads the DLL when the executable starts.

For long-term reliability, installing the VC++ Redistributable is strongly recommended instead of manual DLL placement.

Summary

vcruntime140_clr0400.dll is a specialized Microsoft C Runtime for applications that combine native C++ with CLR 4.0 using the VC14+ toolchain. It supports mixed-mode assemblies built with C++/CLI.

Most errors occur when the Visual C++ Redistributable is missing, corrupted, or mismatched. Installing the correct redistributable or restoring a verified copy of the DLL usually resolves the issue.