This allows llvm-rc to serialize ACCELERATORS resources.
Additionally, as this is the first type of resource to support basic optional resource statements (LANGUAGE, CHARACTERISTICS, VERSION),
ACCELERATORS statement documentation: msdn.microsoft.com/en-us/library/windows/desktop/aa380610.aspx
Accelerator table structure documentation: msdn.microsoft.com/en-us/library/windows/desktop/ms648010.aspx
Optional resource statement fields are described in: msdn.microsoft.com/en-us/library/windows/desktop/ms648027.aspx
(I somehow can't make these links to be clickable.)
Thanks for Nico Weber for his original work in this area.