This header is defined in a 64 bytes header. It contains only some informations about versions.
typedef struct tagIRBHEAD {
unsigned char FileType[5]; /* 1x4 0 */
unsigned char softversion[15]; /* 1x12 5 */ // Cam software version ?
unsigned char version[4]; /* 4x1 21 */ // = 100
unsigned char subversion[4]; /* 4x1 25 */ // = 64
unsigned char totalindex[4]; /* 4x1 29 */ // = 14
unsigned long int spare[8];
} IRBHEAD;