Under MiKTeX formats, I have the following which cannot be built:

I know that the input file should be mpost.ini or the sort but I can't get it work. What I am trying to do is exclude this from being built when doing Update Formats. Selecting Exclude this format when updating all formats does not do the job. I suspect the problem lies in the compiler. The compilers are shown below:

Is it safe to remove the format or recreating it if needed?
Update
Unfortunately, I cannot delete the format from within the settings of MiKTeX. Can this be done from a settings file which I hope exists? That is, is there a file that contains all of the formats settings and thus editing this will remove it from the settings of MiKTeX?
.memfiles (analog to.fmtfiles for TeX) any more, nor the configuration files call for their creation (at least on TeX Live, but it should be the same on MiKTeX). – egreg Nov 13 '12 at 21:01