Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. FL Studio) could share the same FL Studio VSTi.dll file, saving valuable memory allocation, therefore making your computer run more efficiently. These files were created so that multiple programs (eg. Dynamic Link Library files, like FL Studio VSTi.dll, are essentially a 'guide book' that stores information and instructions for executable (EXE) files - like mrt.exe - to follow. FL Studio VSTi.dll is considered a type of Dynamic Link Library (DLL) file.
