Mrifk should be run from a shell prompt, with the file to decompile as
its only argument. It will write source code to standard out. You can use
">" to redirect the output to a file, like this:

  mrifk story.ulx > story.inf

As of release 2, Mrifk supports the "-S" command line option to skip the
decompilation pass (causing it to act as a disassembler).

For more information or to contact the author, visit
   http://www.exmsft.com/~benrg/if-decompilers/