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//0x1c bytes (sizeof)
struct _DRIVER_EXTENSION
{
    struct _DRIVER_OBJECT* DriverObject;                                    //0x0
    LONG (*AddDevice)(struct _DRIVER_OBJECT* arg1, struct _DEVICE_OBJECT* arg2); //0x4
    ULONG Count;                                                            //0x8
    struct _UNICODE_STRING ServiceKeyName;                                  //0xc
    struct _IO_CLIENT_EXTENSION* ClientDriverExtension;                     //0x14
    struct _FS_FILTER_CALLBACKS* FsFilterCallbacks;                         //0x18
};