Advapi32.dll is an advanced Windows 32 base API DLL file that provides access to functions beyond the kernel. This API services library supports security and registry calls. Also included are things like shutdown/restart the system (or abort), start/stop/create a Windows service, and manage user accounts.
Never call the registry functions within DllMain. These functions are implemented in Advapi32.dll. If Advapi32.dll is not initialized before your DLL, the DLL can access uninitialized memory and cause the process to crash.
Relationship with Wine
However, information that has been documented by Wine is of interest to us: