The tools menu will run any application in the plug-ins sub-directory. The menu will only appear if there are tools in the directory to show.
Two plug-ins are included with MXFixer,
RipTest
This plug-in will check the RIP in the file and if not present and correct will replace it with a correct one
FixAspect
This plug-in will force the aspect ratio in the desciptor to the value 16/9.