The "msvcp140d_app.dll" file is a part of the Microsoft Visual Studio 2015 development environment, specifically associated with the debug version of the Microsoft C Runtime Library. The "msvcp" prefix stands for Microsoft Visual C++ (where "cp" indicates C++), "140" denotes the version corresponding to Visual Studio 2015, "d" signifies that this is a debug version of the library, and "_app" suggests that this DLL is intended for applications developed with the Universal Windows Platform (UWP).
This DLL contains the C++ standard library functions used by applications compiled in debug mode with Visual Studio 2015. The debug version of the library includes additional diagnostic information useful during the development and debugging phases, such as more detailed error messages and checks for common programming errors. It's important to note that debug libraries are larger and slower than their release counterparts because of these extra diagnostic features and are not intended for use in production environments.
When there's an error related to "msvcp140d_app.dll," it typically indicates that the DLL is missing or not accessible by an application being debugged, potentially because Visual Studio or the Visual C++ redistributable for Visual Studio 2015 isn't properly installed on the system. This can prevent applications built in debug mode from running correctly, as they depend on this DLL for various runtime functionalities.
To resolve issues with "msvcp140d_app.dll," ensuring that Visual Studio 2015 is correctly installed is a crucial first step. For developers working on UWP applications or others using this specific version of the runtime library, confirming that the project's settings are correctly configured to link against the debug runtime libraries is also important. Additionally, installing or repairing the Visual C++ Redistributable Packages for Visual Studio 2015 might help ensure that all necessary runtime components are available on the system.
Given that "msvcp140d_app.dll" is used for debugging, it's typically not distributed with the final release of an application. Developers should ensure that their applications are linked against the release version of the runtime libraries before deployment. If the problem persists, consulting the documentation for Visual Studio 2015 or seeking support from Microsoft or developer communities can provide more targeted guidance and solutions.
