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//0x20 bytes (sizeof)
struct _IO_WORKITEM
{
    struct _WORK_QUEUE_ITEM WorkItem;                                       //0x0
    VOID (*Routine)(VOID* arg1, VOID* arg2, struct _IO_WORKITEM* arg3);     //0x10
    VOID* IoObject;                                                         //0x14
    VOID* Context;                                                          //0x18
    ULONG Type;                                                             //0x1c
};