MSVCR100.dll and VCRUNTIME140.dll are Microsoft Visual C++ runtime components used by native Windows applications. Although both support programs developed with Microsoft’s Visual C++ toolchain, they belong to different runtime generations and provide different runtime functionality.
Understanding the differences between MSVCR100 vs VCRuntime140 is useful when troubleshooting missing-DLL errors, examining application dependencies, or maintaining software built with different Visual C++ versions.
MSVCR100 vs VCRUNTIME140 at a Glance
| Feature | MSVCR100 | VCRUNTIME140 |
| DLL file | msvcr100.dll | vcruntime140.dll |
| Runtime generation | Visual C++ 2010 | Visual C++ 2015 and later |
| Primary role | Microsoft C Runtime Library | Microsoft Visual C++ C/C++ runtime support |
| C++ Standard Library counterpart | msvcp100.dll | msvcp140.dll |
| Common compiler family | Visual C++ 2010 | Visual C++ 2015–2022 toolsets |
| Typical use | Legacy native Windows software | Newer native Windows software |
| 32-bit/64-bit considerations | Yes | Yes |
| Interchangeable | No | No |
| Can coexist | Yes | Yes |
What Is MSVCR100?
MSVCR100.dll is the Microsoft C Runtime Library component associated with Visual C++ 2010.
Applications compiled with Visual C++ 2010 can use MSVCR100 for common C runtime functionality. The shared runtime approach allows applications to rely on library routines without embedding every runtime implementation directly into their executable.
MSVCR100 Features
MSVCR100 can provide functionality involving:
- Standard C library routines
- Memory allocation and management
- File input and output
- String and character operations
- Mathematical functions
- Formatted input and output
- Runtime initialization and termination
- Environment-related functionality
It is therefore commonly encountered in older applications developed with the Visual C++ 2010 toolchain.
What Is VCRUNTIME140?
VCRUNTIME140.dll is a Microsoft Visual C++ runtime component introduced with the Visual C++ 2015 runtime family and used by applications built with compatible newer Visual C++ toolsets.
The VCRUNTIME component provides core runtime support needed by compiled C and C++ programs. It is distinct from the C++ Standard Library component, which is represented by files such as msvcp140.dll.
VCRUNTIME140 Features
Depending on the application, VCRUNTIME140 can provide support for areas such as:
- Runtime initialization
- C and C++ exception handling
- Runtime termination
- Compiler-generated runtime operations
- Security-related runtime support
- Type-related runtime functionality
- Other low-level Visual C++ runtime services
The exact functions used depend on the compiler, application, and runtime configuration.
Core Difference Between MSVCR100 and VCRUNTIME140
The most important distinction is that the two DLLs belong to different Visual C++ runtime architectures.
- MSVCR100 is the C Runtime Library associated with Visual C++ 2010.
- VCRUNTIME140 is part of the newer Visual C++ 2015-and-later runtime family and supplies core runtime functionality.
The Visual C++ runtime architecture changed significantly beginning with Visual C++ 2015. Microsoft subsequently maintained binary compatibility across the Visual C++ 2015, 2017, 2019, and 2022 toolsets for applications using the supported runtime family.
As a result, VCRUNTIME140 is not simply a newer filename for MSVCR100, and MSVCR100 cannot be substituted for VCRUNTIME140.
Feature and Functionality Comparison
MSVCR100
MSVCR100 provides a broad C runtime implementation associated with Visual C++ 2010.
Its responsibilities can include:
- Standard C functionality
- Memory management
- File operations
- String processing
- Mathematical operations
- Runtime services
It is designed around the runtime model used by Visual C++ 2010.
VCRUNTIME140
VCRUNTIME140 provides core runtime functionality for the newer Visual C++ runtime architecture.
It can support:
- C/C++ program startup and shutdown
- Exception handling
- Compiler-generated runtime functionality
- Runtime checks and related support
- Other low-level operations required by applications built with newer Visual C++ toolsets
The newer runtime separates some functionality that was previously bundled differently in older Visual C++ runtime libraries.
Performance Considerations
A direct performance comparison between MSVCR100 and VCRUNTIME140 is difficult because they are not equivalent libraries providing the same complete set of functionality.
Performance depends on:
- The application’s code
- Compiler and optimization settings
- Runtime functions being called
- Memory allocation patterns
- Algorithms and data structures
- Application workload
- Other linked libraries
MSVCR100 may handle a broader range of traditional C runtime operations, while VCRUNTIME140 focuses on core runtime services within the newer Visual C++ runtime architecture.
The DLL version alone therefore should not be interpreted as a direct measurement of application performance.
Compatibility
MSVCR100 Compatibility
MSVCR100 is associated with software compiled using Visual C++ 2010.
Compatibility depends on:
- Application architecture
- Visual C++ runtime dependency
- Windows environment
- Installed runtime components
- Other native dependencies
A program specifically compiled against the Visual C++ 2010 runtime can continue to require MSVCR100 even when newer Visual C++ redistributables are installed.
VCRUNTIME140 Compatibility
VCRUNTIME140 is associated with the Visual C++ 2015-and-later runtime family.
The runtime family introduced with Visual C++ 2015 was designed to provide binary compatibility across supported later Visual Studio toolsets, subject to Microsoft’s compatibility requirements.
However, that does not mean that every application using an older Visual C++ runtime can automatically use VCRUNTIME140. Applications compiled against Visual C++ 2010 can retain their original runtime dependencies.
Runtime Requirements
MSVCR100 Requirements
Software requiring MSVCR100 generally needs the appropriate Visual C++ 2010 Redistributable.
The correct architecture is important:
- 32-bit applications may require the x86 runtime.
- 64-bit applications may require the x64 runtime.
The architecture of the application, rather than Windows alone, determines which runtime component may be needed.
VCRUNTIME140 Requirements
Applications requiring VCRUNTIME140 generally depend on the appropriate Microsoft Visual C++ Redistributable associated with the Visual C++ 2015-and-later runtime family.
Depending on the software, additional components such as msvcp140.dll may also be required.
Architecture remains relevant for VCRUNTIME140 as well, so x86 and x64 application requirements should be considered separately.
Common Use Cases
MSVCR100 Use Cases
MSVCR100 may be encountered in:
- Legacy Windows desktop applications
- Older PC games
- Scientific and engineering software
- Older multimedia applications
- Native applications developed with Visual C++ 2010
- Software with long-standing Visual C++ 2010 dependencies
VCRUNTIME140 Use Cases
VCRUNTIME140 may be encountered in:
- Modern Windows desktop applications
- Current and recent PC games
- Professional native applications
- Development tools
- Software built with Visual C++ 2015 or later toolsets
- Applications using newer Microsoft C++ compiler environments
An application can also require both newer runtime components such as VCRUNTIME140 and MSVCP140.
Common Missing-DLL Errors
The two DLLs can produce similar Windows startup errors, but they identify different runtime dependencies.
MSVCR100.dll Errors
Typical messages include:
- msvcr100.dll was not found
- The program can’t start because msvcr100.dll is missing
- Application startup errors related to the Visual C++ 2010 runtime
VCRUNTIME140.dll Errors
Typical messages include:
- VCRUNTIME140.dll was not found
- The program can’t start because VCRUNTIME140.dll is missing
- Application startup errors related to the newer Visual C++ runtime
These errors should not normally be resolved by renaming or substituting one DLL for the other.
Pros and Limitations
MSVCR100
Pros
- Provides established C runtime functionality for Visual C++ 2010 applications.
- Supports a large range of legacy Windows software.
- Provides shared runtime services for compatible applications.
- Remains relevant where applications retain Visual C++ 2010 dependencies.
Limitations
- Belongs to an older Visual C++ runtime generation.
- Is not compatible as a drop-in replacement for VCRUNTIME140.
- Older applications may require a separate Visual C++ 2010 redistributable even when newer runtimes are installed.
VCRUNTIME140
Pros
- Provides core runtime functionality for applications using the newer Visual C++ runtime architecture.
- Supports applications built with Visual C++ 2015-and-later toolsets.
- Benefits from the unified runtime approach used across supported newer Visual C++ versions.
- Can coexist with older Visual C++ runtime components.
Limitations
- Does not replace MSVCR100 for applications specifically built against the Visual C++ 2010 runtime.
- May be only one of several runtime DLLs required by an application.
- Requires the appropriate architecture and compatible redistributable environment.
MSVCR100 vs VCRUNTIME140: Practical Differences
For troubleshooting purposes, the distinction can be simplified to:
- MSVCR100 → Visual C++ 2010 C Runtime Library
- VCRUNTIME140 → Core runtime component of the Visual C++ 2015-and-later runtime family
- They belong to different runtime architectures.
- They are not interchangeable.
- An application may require additional runtime files alongside either DLL.
- Installing a newer Visual C++ runtime does not automatically eliminate every dependency on an older runtime.
One important distinction is that VCRUNTIME140 should not be viewed simply as “MSVCR100 version 140.” The naming reflects a change in Microsoft’s Visual C++ runtime structure rather than a straightforward version-number progression of the same DLL.
Installation and Troubleshooting Considerations
When an application reports that msvcr100.dll or vcruntime140.dll is missing, the appropriate approach is to identify the runtime dependency and install the corresponding Microsoft Visual C++ Redistributable.
Individual DLL files downloaded from unofficial sources can be modified, outdated, or incompatible with the application. Installing the appropriate redistributable is generally a more reliable way to supply the runtime components an application expects.
It is also important to verify whether the affected application is 32-bit or 64-bit and whether other Visual C++ runtime DLLs are required.
Conclusion
MSVCR100 and VCRUNTIME140 are distinct Visual C++ runtime components from different generations. MSVCR100 is associated with the Visual C++ 2010 C Runtime Library, while VCRUNTIME140 is part of the newer Visual C++ 2015-and-later runtime family and provides core runtime services.
Their different architectures, functionality, compatibility models, and application dependencies mean that neither DLL should be treated as a replacement for the other. Identifying the exact runtime component requested by an application is therefore important when evaluating compatibility or resolving missing-DLL errors.