DEFRCFILE points to the default resource file. The file is read each time MHonArc is invoked. The file is read before processing the resource file specified by the RCFILE resource and before command-line options are processed. The default resource file allows you change the default values resource values of MHonArc.
If the above does not exist, then:
Replace .mhonarc.rc with MHONARC.RC if running under MSDOS/Windows.