Microsoft Resource Library
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What is an RLL file?
An RLL file is a resource library used by various Windows programs. It contains program resource information, such as program data and global parameters. RLL files typically store resources for a corresponding dynamic link library (.DLL) file.
RLL files may be used for application extensions. For example, an RLL file can store localization information for a program, such as foreign language support. RLL files are included in some Windows service pack updates.