However, if a DLL file becomes corrupted or goes missing, it can cause issues with any program that relies on it. Instead of every application having its own copy of every function, common functions are kept in these DLL files so they can be shared among many applications. These DLL files enhance the efficiency of software applications and the operating system by providing shared access to a common set of functions. Btools.dll is a Dynamic Link Library (DLL), designed as a repository for code, data, and resources among various programs.