Currently the only known way to establish the file type of a .qtch file is to employ a packet sniffer and search for the stream's file type as it is received by the network card.
kˈɜːɹəntli ðɪ ˈoʊnli nˈoʊn wˈeɪ tʊ ɪstˈæblɪʃ ðə fˈaɪl tˈaɪp əvə .kjˌuːtˌiːsˌiːˈeɪtʃ fˈaɪl ɪz tʊ ɛmplˈɔɪ ɐ pˈækɪt snˈɪfɚ ænd sˈɜːtʃ fɚðə stɹˈiːmz fˈaɪl tˈaɪp ˌæzɪtˌɪz ɹᵻsˈiːvd baɪ ðə nˈɛtwɜːk kˈɑːɹd.