RLL files store resources for DLL files. They may be used for application extensions like foreign language support. RLL files are in some Windows updates. Never install a downloaded DLL file unless you trust the source, to protect against malware. DLL files are “Dynamic Link Libraries”. They allow Windows programs to share data and resources. DLLs cannot be displayed or opened directly. They provide resources for other programs. DLL and EXE files have the same format. Both use the Portable Executable file format. DLLs can contain functions, classes, variables, UIs and resources used by EXEs or other DLLs. There are two library types: static and dynamic.
Microsoft Windows