Microsoft public PDB extracted structures/enums (including functions). Just use the "search" button when needed.
structs_list.txt contains the full structs list (approx. 30k), without enums and RTTI/MIDL linked structs.
Windows 10 build 1809 rev 17763.379 (system32 + drivers files) + Powershell + SymCheck + SymExp + grep enum/struct