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//0x6c bytes (sizeof)
struct _FNSAVE_FORMAT
{
    ULONG ControlWord;                                                      //0x0
    ULONG StatusWord;                                                       //0x4
    ULONG TagWord;                                                          //0x8
    ULONG ErrorOffset;                                                      //0xc
    ULONG ErrorSelector;                                                    //0x10
    ULONG DataOffset;                                                       //0x14
    ULONG DataSelector;                                                     //0x18
    UCHAR RegisterArea[80];                                                 //0x1c
};