Hi,
Minitab .mtp files can be opened directly in JMP. If you have .mpx files, you can convert them to .xls or .csv files and then import those into JMP. Of course, the analysis will need to be redone.
One question I have is if the analyses done on all these files is the same? In that case, you can save the scripts or create them using the Workflow builder to automate this process.