The api-ms-win-crt-convert-l1-1-0.dll file is a module containing functions used by various programs developed with Visual Studio 2015 and later. The filename stands for "Application Programming Interface - Microsoft Windows - C Runtime - Convert - Level 1 - version 1.0".
The file is part of the Windows API Set, which is a technology introduced in Windows 7 and is used to isolate API definitions from their implementation in DLLs. The api-ms-win-crt-convert-l1-1-0.dll file is a stub DLL that redirects API calls to the actual implementation in the appropriate DLL.
If you encounter an error related to this file, it may indicate that the file is missing, corrupt, or not properly registered. This can happen if you are trying to run a program that was built with Visual Studio 2015 or later on a system that does not have the required runtime libraries installed. To fix this, you can try installing the latest version of the Visual C++ Redistributable package, which includes the required runtime libraries.