Microsoft C Runtime !!top!! May 2026

Previously, every version of Visual Studio had its own CRT DLL (e.g., msvcr100.dll , msvcr110.dll ). This led to "DLL Hell" where a user needed 5 different versions of the redistributable installed.

Even if you write “modern C++” (using std::vector , std::string , std::unique_ptr ), the CRT is still there underneath: microsoft c runtime