16bit COM interfaces are cdecl, not WINAPI.
[wine] / dlls / dswave / dswave.spec
1 @ stdcall -private DllCanUnloadNow() DSWAVE_DllCanUnloadNow
2 @ stdcall -private DllGetClassObject(ptr ptr ptr) DSWAVE_DllGetClassObject
3 @ stdcall -private DllRegisterServer() DSWAVE_DllRegisterServer
4 @ stdcall -private DllUnregisterServer() DSWAVE_DllUnregisterServer