DEBUG_FILE *debug_fopen(const char *filename, const char *mode);
debug_fopen opens the filename on the host PC and returns a stream or 0 if the open fails. The filename is a host PC filename which is opened relative to the debugger working directory. The mode is a string containing one of:
followed by one of:
debug_fopen returns a stream that can be used to access the file or 0 if the open fails.