If it's not AXX, research the real file extension to learn more about the format and find which program is capable of opening it.
Ọ bụrụ na ọ bụghị AXX, nyochaa nchịkọta ndozi n'ezie iji mụtakwuo banyere usoro ọ dị na ya na ihe omume nwere ike imeghe ya.