Hi @Ayhan14
I am unfamiliar with mhx extension, which part and end tool are you going to use to process this extension?
I do not know the ARM toolchain supports this extension, if it does you could try a command, and those commands can be invoked by the MCUXpresso, as after build commands. See this entry from Erich Styger's blog MCUXpresso IDE: S-Record, Intel Hex and Binary Files
Diego
