extern const uint8_t ff_w64_guid_riff[16];
extern const uint8_t ff_w64_guid_wave[16];
extern const uint8_t ff_w64_guid_fmt [16];
+extern const uint8_t ff_w64_guid_fact[16];
extern const uint8_t ff_w64_guid_data[16];
extern const uint8_t ff_w64_guid_summarylist[16];