Notes about the LLSD file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The LLSD file type is primarily associated with 'Linden Lab' by Linden Research, Inc.. LLSD provides a flexible data system similar to the data facilities of dynamic languages like Perl and Python. It is created to support exchange of structured data between loosely coupled systems.